BBC news Europe reporter tweets:

At least two of those wounded in the attacks are in a critical condition at the city's Clinique Saint-Jean, external, hospital officials said.

Three more need moderate to urgent care.

The hospital admitted 22 people. The rest had minor injuries, and physical and mental trauma. Most had suffered burns, wounds from projectiles or smoke inhalation.

The other injured people are likely to have been taken to different medical facilities, including a hospital specialising in burns near the airport and a children's hospital. 

Image source, AP

Garry Rowley, who lives just minutes from Maelbeek metro station, tells the BBC what he saw this morning.

"I saw police cars racing towards the scene and then saw people coming out of the station very dazed and upset.

"Some had blood on their bodies and faces. They were in shock. I could smell the smoke.

"There has been a huge amount of activity since. There were bomb squad and commandos and there has been another bomb scare in the area since.

"There are helicopters circling overhead and the area is still cordoned off. We have been told to stay indoors.

"There is quite a lot of anger now as people were expecting something to happen, but you can't prepare yourself for when it does."

Brussels Airport will be closed on Wednesday, the CEO of Brussels Airport Company Arnaud Feist tells Reuters.

Image source, PA

King Philippe will speak at 19:00 local time (18:00 GMT). Earlier, a Royal Palace spokesperson said the King and Queen Mathilde had been left "shocked" by the attacks.

Security services found and destroyed a third bomb at Zaventem Airport, the provincial governor of Brabant Flanders has said.

Charlie Winter, an expert in jihadist militancy, tweets:

Carmen Quint, a student at the Free University Brussels (VUB), tells the BBC she is currently on lockdown in a lecture hall after a suspected bomb scare.

"We have been told by the bomb squad to stay here. I was evacuated from my student residence, really roughly and urgently by the army," she says.

"They are currently searching the whole campus. I heard from others that there was a controlled explosion near my student residence building on the VUB campus. I didn't hear it myself though. People in the lecture hall are worried, some are crying. They have put on a film and brought out some food to try and keep everyone calm."

The university has just announced it is to close for the rest of the week.

Image source, AFP/Getty

An image widely published by Belgian media is said to show three men who are believed to have carried out the attack at Zaventem Airport.

The two men dressed in black are believed to have blown themselves up, while the man in white is thought to have escaped, RTBF reported, external.

The men in black both appear to be wearing a single black glove on their left hands, which some reports suggest could have been in order to conceal detonators.

The image was unintentionally leaked on to social media by Belgian police before the authorities later confirmed its authenticity, local media said.

EU leaders have released a statement:

"The European Union mourns the victims of today's terrorist attacks in Brussels. It was an attack on our open democratic society.  

"Our common European institutions are hosted in Brussels, thanks to the generosity of the government of Belgium and the Belgian people. The European Union and its member states stand firm with Belgium in solidarity and are determined to face this threat together with all necessary means.

"This latest attack only strengthens our resolve to defend the European values and tolerance from the attacks of the intolerant. We will be united and firm in the fight against hatred, violent extremism and terrorism."

For all the latest details on the disruption in Brussels and elsewhere in Europe see our crisis information updates.

Our correspondent Gavin Lee is live on Facebook now from near the airport in Brussels.

Click here to participate, external.

Image source, AFP

Asif Islam witnessed the two explosions at Zaventem airport as he dropped his mother off for a flight.

Speaking to BBC Radio 5 live, he said they began running after the first explosion, before another, much larger blast occurred in the direction they were headed.

“It was crazy, you could see the ceiling falling down little by little... It was a really dusty,” he said.

“After a certain time we couldn't breathe anymore so we were we had to get out because otherwise we would just die because of the dust.”

Image source, Getty Images

A crisis centre spokesman tells Reuters the death toll currently stands at 30 - 20 at Maelbeek metro station and 10 at Zaventem Airport.

BBC Monitoring

The so-called Islamic State group has claimed responsibility for the Brussels attacks in a statement issued via its A'maq news agency.

BBC Europe editor tweets:

US Republican presidential front runner Donald Trump said the attacks showed the need for a much tougher Western response to jihadist violence.

Democratic candidate and former US secretary of state Hillary Clinton said: "Today's attacks will only strengthen our resolve to stand together as allies and defeat terrorism and radical jihadism around the world."

Ted Cruz, currently lying second in the race for the Republican nomination, said the attacks were not "isolated incidents" and said the West was "at war with radical Islam".

Image source, EPA

 BBC World Service journalist tweets:

Three Mormon missionaries serving in the Paris mission were seriously injured, external in the explosion at Brussels airport, The Church of Jesus Christ of Latter-day Saints said in a press release.

The three men, from Utah, are in hospital and a fourth missionary who was with them had already passed through airport security, the church added.