Two explosions occurred in the departure area and the subway station of the Zaventem airport in Brussels, Belgium.

The deathtoll increased to 13 people while 35 sustained severe injuries.

The source of the explosive device is still unknown. The Zaventem airport is being evacuated by all airport staff and passengers. All incoming flight schedules are also cancelled.  

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The rail transport services have been cancelled and people are highly advised not to go to the airport. The city museums were also shut down.

The European Union Metro Station initiated a lockdown after the airport attacks. To ensure safety, all staff and personnel were highly advised to stay inside.

The airport blasts comes four days after Salah Abdeslam, the primary suspect for the Paris attacks, was captured in Brussels.

Abdesalam was born and raised in Brussels. The 26-year-old suspect confessed to the investigators that he wanted to participate as a suicide bomber during the Paris attacks but backed out at the last minute.

The Belgian Police warned that there might be repercussions after Abdesalam's arrest. Jan Jambon, Belgium's interior minister, previously stated through a radio interview that the country was on high alert for any terrorist activity or a possible attack of revenge.

Prior to the two explosions, shots were fired and there was someone reciting a line in Arabic language, Reuters reported.

The emergency services have cleared the airport after the explosion but more bombs have been identified in the vicinity, according to Het Laatse Nieuws, a Belgian News Network.

"I was on a break and heard and felt a big explosion," said Niels Caignau, a Swissport employee.

Caignau added that they saw the whole incident over the departure hall and a huge cloud of smoke rose from the airport building.

British Prime Minister David Cameron expressed his concern over Belgium's safety through Twitter.

"We will do everything we can to help," wrote Cameron.

World leaders from Georgia, Lithuania, Latvia, and Republic of Kosovo also expressed the same sentiment.

Cameron recently announced that he will soon chair an important meeting for COBRA, UK's emergency commitee. 

The Zaventem airport is located approximately 11km from Brussels and handled 23 million passengers last 2015.

TagsBrussels, explosions, Airport, subway station, 13 dead, bombings, revenge in Paris attacks