A series of terrorist attacks in Brussels left at least 30 people dead and 230 injured on Tuesday, with the Islamic State extremist group claiming responsibility for the violence in the Belgian capital.

Here is a chronology of the day.

Around 8 am (0700 GMT): Two consecutive explosions take place in the departure hall of the Brussels international airport.

8:50 am: All flights to and from Brussels are diverted, the Belgian broadcaster RTBF reports.

Around 9:15 am: Another explosion takes place in the Maelbeek subway station, near the seat of the European Union's institutions. A few minutes later, all subway stations in Brussels are closed.

9:23 am: Belgium raises its threat level to 4, indicating a "serious and imminent" threat.

9:57 am: RTBF said that 10 people have died in the airport explosion, a few minutes later 13 victims are reported.

10:08 am: First reports of a suicide bombing are issued but not initially confirmed by the police. Security authorities are said to assume that the explosions were terrorist attacks.

10:37 am: Belgium's crisis centre calls on the population to stay where they are, at home or at work.

11:08 am: All train stations are shut down in Brussels. The Eurostar and Thalys high-speed operators stop running trains to the Belgian capital.

12:15 pm: Health Minister Maggie De Block says that 11 people have died in the airport attack, with another 81 injured.

2:35 pm: Mayor Yvan Mayeur says at least 20 people have died in the attack on the subway station, while 14 were killed in a suicide attack at the airport.

3:26 pm: US President Barack Obama condemns the attacks from Havana.

3:53 pm: RTBF reports that Belgium will hold three days of national mourning.

4 pm: Belgium's crisis centre says that at least 30 people are believed to have died in the two attacks, while at least 230 were injured.

4:04 pm: Police have ended their search for weapons and suspects at the airport, Belga reports. But police raids are being carried out in other parts of Brussels.

4:37 pm: The Islamic State extremist group claims responsibility for the attacks, according to its Amaq news agency.

5:34 pm: RTBF reports that a third bomb was found in the airport that did not detonate.

6:20 pm: The Belgian police asks for the public's help in identifying a suspect in the airport attack. They release a video-surveillance picture showing a man wearing glasses, a black hat and a white jacket. He is pushing an airport trolley carrying a black duffel bag.

6:40 pm: Belgian Prime Minister Charles Michel tells the "barbaric enemies of liberties, of democracy, of fundamental values" that there is a determination to "protect our liberties, our ways of living."

6:47 pm: Federal prosecutor Frederic Van Leeuw says that investigators think two men managed to carry out suicide bombings at the airport.

7:11 pm: Police have found an explosive device containing nails, chemical substances and an Islamic State flag during a raid in the Brussels neighbourhood of Schaerbeek, prosecutors say in a statement.

7:17 pm: King Philippe calls in a televised address to the nation for Belgium to react with "firmness, with calm and dignity."

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