IS claims responsibility for Brussels blasts
The Islamic State group on Tuesday officially claimed responsibility for the attacks in Brussels that left some 35 people dead and threatened further violence.
In a statement posted online, the group said "soldiers of the caliphate" had carried out the attack against "the crusader state" of Belgium.
The Brussels attackers, who also wounded more than 200, wore suicide vests and carried explosive devices and machineguns, the statement said, adding that they "detonated their vests" amid their victims at the Brussels airport and on the metro.
The statement vowed "dark days ahead" for states fighting the jihadists.
Meanwhile, German Chancellor Angela Merkel said she was horrified by the deadly attacks in Brussels and vowed Germany's help to "find, arrest and punish" the perpetrators.
"The horror is as boundless as the determination to defeat terrorism," Merkel said, adding that she had expressed Germany's "solidarity" in a phone call with Belgian Prime Minister Charles Michel.
"We will cooperate in every way with his government and with the Belgian security forces to find, arrest and punish those responsible for today's crimes," Merkel said.
"The murderers of Brussels are terrorists without any regard for the principles of humanity... The perpetrators are enemies of all values for which Europe stands today."