The Islamic State group claimed responsibility for the attacks in Brussels, saying its extremists opened fire in the airport and "several of them" detonated suicide belts.
The posting in the group's Amaq news agency said another suicide attacker detonated in the metro.
The posting claimed the attack was in response to Belgium's support of the international coalition arrayed against it.
Belgian authorities have published a picture (above) which purports to show the three suspects from the airport bombing. A Belgian prosecutor said the two men on the left were probably suicide bombers. The twe men are seen wearing gloves on their left hands, possibly to hide detonators. The third man, whom authorities are still working to identify, is suspected to be at large.
The man, right, is wearing a thick light-colored jacket with a black hat and glasses. The Belgian police are urging the public to call them if they recognize the man. A manhunt has been launched.
IS flag, chemicals found in raid
In the meantime, Belgian federal prosecutors say a house search in the Brussels neighborhood of Schaerbeek has "led to the discovery of an explosive device containing among other things nails."
Investigators also found chemical products and an Islamic State flag. Their statement said the Islamic State group had claimed responsibility for the attacks in Brussels via a press agency but that this information still needs to be verified.
Prosecutors say it's not possible at this stage to establish any links between the attacks Tuesday in Brussels and those in Paris on Nov. 13 that left 130 people dead.
EU leaders' response
European Union leaders are pledging to tackle the terrorism threat with "all necessary means" after attacks on Brussels — the EU capital — that killed at least 31.
The heads of state and government of the 28-nation union said in a statement that Tuesday's attack "only strengthens our resolve to defend European values and tolerance from the attacks of the intolerant."
They pledged to be "united and firm in the fight against hatred, violent extremism and terrorism."
The statement didn't elaborate on possible EU measures in response to the attacks.
The British government is warning Britons against all but essential travel to Brussels the wake of the bomb attacks.
Prime Minister David Cameron's office said the travel advice was being changed in line with the advice issued by Belgium authorities. Downing St. said a team of British police had been sent to Brussels to help with the investigation into the attacks that have killed at least 34 people and wounded nearly 190.
German Chancellor Angela Merkel has pledged Belgium's prime minister her country's "full solidarity" following the attacks and says her Cabinet will discuss the bombings on Wednesday. Merkel spoke with Prime Minister Charles Michel and promised that "we will work in every way with his government and the Belgian security forces to find those responsible for today's crimes, detain and punish them."
Merkel says "our strength lies in our unity, and our free societies will prove to be stronger than terrorism."