Belgian prosecutors appealed for help in finding a man suspected of leaving a bomb at Brussels Airport on March 22, saying they were eager to find a coat he had discarded and to speak to people who saw him on his hour-long walk back into the city.
Federal prosecutors released new pictures of the suspect, dubbed the "man in the hat," who appeared to arrive at the airport with two suicide bombers and left along with passengers after the first two bombs exploded.
In a video to accompany their appeal, investigators indicate the route the man took, out of the airport, through the nearby town of Zaventem and along a main road into the city. His last appearance on security cameras was in the district of Schaerbeek almost an hour after the bombing.
Along the way, he took off his light-colored coat and was then seen in a light blue shirt with dark patches. He was wearing a dark hat throughout.