The new information brings the total number of terrorists suspected in the attacks to five.
Authorities in Brussels have released a sketch showing a new suspect they believe took part in the deadly metro bombing.
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The new information brings the total number of suspected terrorists in the attack to five. The man shown in the sketch is believed to have escaped the blast, meaning there could still be two terrorists on the run.
An attacker dubbed "the Man in White" is also believed to be on the loose, authorities say. He was pictured at the airport with two other suspects, who were killed by suicide bombs before the attacks on Tuesday morning.
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The two airport suicide bombers have been identified as Najim Laachraoui and Ibrahim El Bakraoui, whose brother, Khalid, is believed to have blown himself up at the Maelbeek Metro station.
The two attacks killed at least 31 people and injured more than 200.
ISIS has claimed responsibility for the attacks in Brussels.
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