Tim Donovan
BBC London, Political Editor

We were expecting the political day to be dominated by tax. The weekend before polling day is one of the last opportunities to convey key messages on political talk shows - important when many voters are said to only engage in the last few days - before the exhausting final hours of the ground campaign ahead.

But instead, again, today has been about terror. Three attacks in three months. Two during the election campaign.

Debate might have lingered about whether or not to campaign, whether or not polling day should - even if it could - be postponed.

In fact there's been broad political unanimity that campaigning should resume as soon as possible after a time for reflection. And there's been agreement that polling day should not be deferred. So the question now is how much events in London Bridge cloud the last four days of campaigning? Will arguments over public services and Brexit be overshadowed now by concerns over policing, intelligence and community cohesion?

If so, it was possible to see - in the short formal responses of the leaders of the two main parties today - the ground on which this will be fought.

NHS England has said 21 people are in a critical condition after the attack.

Image source, Getty Images

At least seven people have died after a van struck pedestrians on London Bridge, followed by a string of knife attacks in nearby Borough Market.

It is the third terrorist attack in England in three months.

22 May: An explosion after a concert by singer Ariana Grande at Manchester Arena killed 22 people.

Salman Abedi detonated a home-made bomb at the arena's foyer.

• Manchester attack: What we know so far

22 March: A car drove across Westminster Bridge, near the Houses of Parliament, hitting pedestrians and killing four people.

The attacker, Khalid Masood, then tried to enter the Palace of Westminster, fatally stabbing police offer Keith Palmer, before being shot dead.

• Westminster attack: What we know so far

The leader of Barking and Dagenham Council Darren Rodwell has released a statement about the arrests in east London:

The chairman of the British Transport Police Federation has spoken of his pride in an officer who took on attackers, armed only with his baton.

Nigel Goodband said his organisation had recieved "many kind messages and uplifting words of support", which he will pass onto the officer.

"We hope these messages will be of some comfort to him and his family," he added.

"We're also thinking of our injured Metropolitan Police colleague and wishing them a swift and full recovery.

"We are in contact with the Metropolitan Police Federation and have passed our best wishes to them."

Details have been released of where the some of the victims of the London Bridge attack are being treated. Two are patients at St Mary's Hospital; nine people are being treated at St Thomas' Hospital; and 14 were taken to Kings College Hospital - all in London. Five victims are being treated at University College London Hospital and 12 people are at The Royal London Hospital. Eight people have been discharged.

Image source, Getty Images

A neighbour of a man suspected of being one of the attackers has spoken of his shock after raids on his block of flats this morning.

Damien Pettit, 31, said he thought the attacker lived on the ground floor of his apartment block and had been there for about three years.

"He's one of our neighbours," he added. "I've said hello in passing more than 50/60 occasions. He has two young kids. He was a very nice guy."

Mr Pettit described his neighbour as a Muslim in his mid-20s who was "very much involved in the area".

"He was someone that has always been a member of the community in terms of wanting to help out," he added. "He's always been very affable, very pleasant."

Mr Pettit saw a photo of one of the attackers in camouflage trousers and recognised them, as his neighbour had been wearing them two days before.

But the attacker was face down, so he couldn't be sure it was him.

Image source, AFP

More people have left flowers near the scene of the attack in London Bridge.

One woman appeared to be comforted by a police officer as she handed over a bunch of flowers to be placed at the scene.

Image source, AFP

Image source, PA

There will be a minute's​ silence across the UK at 11:00 BST on Tuesday to remember those affected by the London Bridge attack, the government has announced. Flags will remain at half-mast on Whitehall government buildings.

A 16-year-old girl whose relatives were desperately searching for her after the attack has been found, according to the Evening Standard, external.

Asya Mustafa's aunt told the paper that her niece lost her phone when she ran from the London Bridge area and she was unable to make contact sooner.

“It has been so emotional and worrying. We are so glad to hear she is safe,” said Tijen Mustafa, thanking those who showed the family support on social media.

Twelve people have been arrested after the London terror attack which left seven people dead and 48 injured.

The arrests in Barking, east London, followed a raid at a flat belonging to one of the three attackers.

Here is a map showing where the raids took place.

The BBC understands that investigators have established the identities of the three attackers.

But home affairs correspondent Danny Shaw said, although they have been identified, they are unlikely to be officially named yet.

Image source, Twitter

The families of two of the victims killed in the Manchester bombing have reached out to those affected by last night's attack.

The parents of teenage couple Chloe Rutherford and Liam Curry said it had been their "worst nightmare" losing their children and thanked all those who helped them during this difficult time.

They added: "We would at this point also like to reach out to those affected by the London terror attack, sending our love and condolences to those who have lost loved ones. Our hearts are aching for your loss.

"May those injured have a speedy recovery."

A spokesman for Mayor of London Sadiq Khan has said Donald Trump is "ill-informed". It comes after Mr Trump earlier criticised Mr Khan:

A spokesman from the mayor's office said Mr Trump had "deliberately" taken the Mr Khan's comments out of context, but he would not be making a personal response.

David Dimbleby's planned programme with Liberal Democrat leader Tim Farron and Scottish National Party leader Nicola Sturgeon, with an audience in Edinburgh, which was due to air from 17:55 BST on Sunday, will be rescheduled.

Research firm YouGov has been publishing daily polls on voting intentions in the run-up to the 8 June election.

"Due to the tragic events at London Bridge and the suspension of national campaigning for the election, YouGov will not be releasing an update to the election model today," the company said on Sunday.

Image source, Getty Images

An off-duty policeman who was one of the first on the scene was stabbed after tackling one of the three attackers.

The officer - who is a rugby player - is in a critical condition after sustaining knife injuries.

Read more here.