brussels airport attack
Najim Laachraoui held four French journalists captive for months, the lawyer of two former hostages said.
Airport staff hugged as the first plane took off.
They're asking the public for help in identifying one of the men.
At least 31 have been killed and more than 200 injured.
WHAT'S HAPPENING
Footage shows passengers pouring out of a metro train into the tunnel.
At least 34 people were killed.