Belgian prosecutors have released CCTV footage of a man suspected of leaving a bomb at Brussels Airport on 22 March.
The man, dubbed the "man in the hat", appeared to arrive at the airport with two suicide bombers and left along with passengers after the first two bombs exploded.
Prosecutors in Belgium have appealed for help in finding the man, saying they were eager to find a coat he had discarded. They are also looking to speak to people who saw him on his hour-long walk back into the city.
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.
Belgian prosecutors release video of a man suspected of leaving a bomb at Brussels Airport https://t.co/MP7Ic5nLfChttps://t.co/Nu7LX4Bn2O
— RTÉ News (@rtenews) April 7, 2016
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-coloured coat and was then seen in a light blue shirt with dark patches. He was wearing a dark hat throughout.
"It is especially the coat which interests us," one Belgian prosecutor told a news conference, asking if anyone might have seen it along the suspect's route.
Prosecutors also want people to come forward who might have filmed or taken a photograph of the suspect or may be able to determine where he went.
Twin bombs at Brussels Airport and another on the city's metro killed 32 people, excluding the suspected bombers. A controlled explosion destroyed a third bomb at the airport about six hours after the initial attack.
