The BBC's Mohamed Osman in Khartoum says the fighting is continuing in some areas of the city including the army headquarters.

The extent of the fighting is unclear, but residents of the Sudanese capital say they can still hear heavy gunfire.

The two rival generals, whose troops have been battling for control, had agreed to a humanitarian pause to allow civilians to escape the fighting and get medical help, but this did not materialise.

The UN's aid chief, Martin Griffiths, says humanitarian workers are being attacked and sexually abused.

He said the UN office in South Darfur had been looted.

Sudanese journalist Muammar Ibrahim has shared these photos from Nyala, South Darfur, which he says show a burnt-down market and looted buildings belonging international organisations:

Multiple reports from Sudan indicate that the much-vaunted humanitarian ceasefire that was supposed to last for 24 hours starting from 18:00 local time (16:00 GMT) has already been broken.

Gunfire and clashes broke out shortly after that time, says the BBC's Sudan analyst Mohanad Hashim.

"This ceasefire didn’t collapse, it didn’t even get the chance to take effect,", external says al-Jazeera journalist Hiba Morgan summing up the weariness felt by many.

A student has been killed by a stray bullet on campus as deadly fighting continues in Khartoum.

A 24-hour ceasefire is meant to be starting now in Sudan, but it's not clear if the rival military factions will respect the humanitarian truce agreed by their leaders.

We will be monitoring events here on the BBC Africa Live page.

Sudan's rival factions are not only fighting on the ground but are also waging a propaganda war, largely though the internet and social media.

A project run by the Atlantic Council, a right-leaning US think tank, says it has discovered more than 900 Twitter accounts that "appear to have been hijacked and refurbished to boost content supportive of Hemedti and the RSF, making the paramilitary force appear more popular than they may be".

You can read more from their DFR lab here, external.

Videos, photos and testimony from Sudan's capital give a picture of how civilians are being impacted.

Danny Aeberhard
BBC World Service

Prosecutors in Switzerland have charged a former Gambian interior minister with crimes against humanity and other offences.

They accuse Ousman Sonko of involvement in - and failure to prevent - systematic attacks on opponents of the former President, Yahya Jammeh.

The charges cover the period from 2000 to 2016.

Mr Sonko's lawyer told the BBC his client had not committed any offences, and rejected allegations that crimes against humanity took place in The Gambia during that time.

Mr Sonko has been held in pre-trial detention in Switzerland for six years, having left The Gambia in 2016 to seek asylum in Europe.

This explosion took place near a military building in Khartoum - the area has seen heavy fighting.

The US secretary of state said the people of Sudan made their democratic aspirations clear.

Image source, Courtesy of Fode Idrissa Kallo

At least 115 fishermen are being treated in Guinea's capital, Conakry, after returning from sea with painful skin lesions.

"It's not a contagious disease - no way", says Karamba Kaba, the doctor in charge of Donka Hospital's burns department, adding:

Hospitals are providing free healthcare to anybody coming forward with these burns.

Treatment begins with a blood test and samples are being analysed in laboratories in Conakry. Patients' wounds are also disinfected to allow them to heal.

Some people have had the lesions on their face, others on their stomach or genitals, and there are fears that some sufferers are scared to come forward for treatment.

According to a doctor based on an island 50km (31 miles) from Conakry, seven other sick fishermen presented themselves to the island's health service but refused to go to to specialised care centre in Conakry for treatment.

A resident of Sudan's capital tells of running out of drinking water as battles rage for a fourth day.

Sudan's rival generals say they have agreed a 24-hour ceasefire following four days of intense fighting in the capital Khartoum and other towns, but elements of the army have denied this which raises doubts that this will actually happen.

The country's de facto leader, Gen Abdel Fattah al-Burhan, told CNN the ceasefire would start at 18:00 local time (16:00 GMT) on Tuesday but it remains to be seen if it will go ahead.

The head of the rival Rapid Support Forces (RSF), Gen Mohamed Hamdan Dagalo, had also said he approved the ceasefire to ensure the evacuation of wounded civilians, but accused the army of violating previous agreements.

Speaking to Al Arabiya TV earlier, a member of Sudan's ruling military council, Gen Shams El Din Kabbashi, said a ceasefire would be used to help bring relief to civilians affected by the fighting:

Image source, Getty Images

Reports from Tunisia say the authorities have banned meetings at all offices of the Islamist opposition party Ennahda, hours after police detained its leader.

Ennahda sources say the headquarters of the Salvation Front opposition coalition have also been closed.

On Monday evening, the Ennahda leader Rached Ghannouchi was arrested at his home in the capital, Tunis - an interior ministry official said he was facing charges of "incitement".

Three more prominent Ennahda officials are also reported to have been detained.

There has been a wave of arrests this year of leading figures opposed to President Kais Saied, who assumed full executive powers almost two years ago.

More on Tunisia:

• Why the president picked on sub-Saharan African migrants
• Tunisia arrests president's critics in crackdown
• How Kais Saied rose to power

Samba Cyuzuzo
BBC Great Lakes

Image source, EAC

The East African Community (EAC) regional forces has been marking one month since that start of a ceasefire between the Democratic Republic of Congo army and M23 rebels.

“The ceasefire has significantly enhanced withdrawal of M23 from areas they occupy,” Gen Jeff Nyagah, the Kenyan commander of the regional force, told reporters in the eastern city of Goma.

Rebel spokesman Willy Ngoma told the BBC that M23 fighters were going to areas marked out for the group as part of the peace process by regional leaders.

However, serious concerns remain about whether peace will last in the east of the country.

M23 insists it will not disarm unless the government agrees to direct dialogue, something President Félix Tshisekedi has ruled out.

M23 began regrouping early last year, a decade after disarming as part of peace agreement, and starting capturing territory in North-Kivu province.

Hundreds of thousands of civilians who then fled their homes remain in camps as they fear returning until their security is guaranteed.

Largely made up of Congolese army deserters, the M23 first took up arms in 2009 accusing the government of marginalising the country's ethnic Tutsi minority and failing to honour previous peace accords.

BBC Monitoring
The world through its media

Egypt’s President Abdul Fattah al-Sisi has confirmed that some Egyptian soldiers are in neighbouring Sudan but are not involved in the ongoing fighting.

He said they were there as part of a joint training initiative and not taking sides in the conflict between the army and the Rapid Support Forces (RSF) paramilitary group.

The RSF posted a video on Twitter on Saturday of what it said were Egyptian soldiers "turning themselves in" at the Merowe military air base in northern Sudan.

"I hope we retrieve these forces at the fastest earliest time," Mr Sisi said.

The president made the comments during a meeting with the Supreme Council of the Armed Forces on Monday, part of which was broadcast on the privately owned Extra News TV.

He said Egypt would not interfere in Sudan’s “internal affairs”, but added it could play a role in mediating between factions "to encourage them to cease fire".

The International Federation of Red Cross and Red Crescent Societies (IFRC) has warned if fighting continues much longer then Sudanese health system "will almost go into a collapse".

It said that it was nearly impossible to provide humanitarian aid in and around the capital Khartoum.

The IFRC's head of delegation for Sudan, Farid Aiywar, is quoted by the Reuters news agency as telling reporters on Tuesday that there were calls from organisations and people trapped in the city "asking for evacuation".

Nearly 200 people have been killed and over 1,800 injured in the fighting between the Sudanese army and the paramilitary Rapid Support Forces (RSF).

Image source, US Antony Blinken/Twitter

UK Foreign Secretary James Cleverly has once again met US counterpart Antony Blinken to discuss the situation in Sudan, with both raising concerns about the assault on the European Union ambassador to Sudan and the attack on a US Embassy convoy in Sudan’s capital Khartoum.

"Indiscriminate military operations have resulted in significant civilian deaths and injuries, and are recklessly endangering the Sudanese people and diplomats," Mr Blinken said in a statement.

He reiterated his earlier call for a 24-hour ceasefire to "allow Sudanese to safely reunite with their families and to obtain desperately needed relief supplies".

The two envoys met and made similar ceasefire calls on Monday.

Mr Blinken is due to have another telephone meeting with Sudan’s de facto leader Gen Abdel Fattah al-Burhan and Rapid Support Forces commander Mohammed Hamdan Dagalo later on Tuesday, about the possibility of a ceasefire to allow residents access to medical care and food supplies.

"RSF soldiers and other types of soldiers are trying to break into homes to loot and there [are] unconfirmed reports of sexual violence," says gender justice and democracy campaigner Hala Y Alkarib, who's been collecting testimony from friends and colleagues across the capital city, Khartoum.

She told BBC Newsday that she and others believe the RSF lacks a supply chain and is therefore relying on looting.

There is nobody to protect the people, she says, "because the Sudanese military and Sudanese police – both of them former partners of the RSF – are not quite oriented to provide or extend protections to civilians".

With shops shut and power supplies intermittent at best, she says Khartoum's inhabitants are at high risk - because many on the outskirts rely "100% on the informal economy" and people living in the centre used to have to leave the city to be able to put food on the table but now can't:

Sudan's army has rubbished claims by its paramilitary RSF rivals that a day-long ceasefire agreement had been reached, calling it mere propaganda.

"We are not aware of any coordination with the mediators and the international community about a truce, and the rebellion's declaration of a 24-hour truce aims to cover up the crushing defeat it will receive within hours," a Sudan Armed Forces spokesman states on the Army Twitter page, external.

"We have entered a critical phase and our efforts are focused on achieving its objectives at the operational level," the army statement adds.

BBC Monitoring
The world through its media

The state-owned Sudan Radio - also known as Radio Omdurman - has remained silent since Saturday.

It is unclear why, as this station broadcasts and operates from the same premises as the state TV channel, which resumed broadcasts on Monday morning having been off air for more than 20 hours.

Reels of patriotic music and footage of the army's victories have been played on TV, and in a statement on Facebook the Sudanese army said it had retaken control of the TV premises from the rival Rapid Support Forces (RSF), external.

State TV also aired a statement by the RSF's spokesman, Naj al-Din Ismael, saying he had defected from the paramilitary group and joined the national army.

Journalists in Sudan have told the BBC as fighting continues there is also a propaganda war between the rival factions of the military, which is largely being fought on social media.