Belgian police issued a new appeal on Monday for information about a man caught on CCTV at Brussels Airport with two others who are thought to have blown themselves up in the check-in area last Tuesday.
It was not clear whether the appeal meant the man, thought to have had a bomb with him, was on the run or that the police were simply trying to bolster their case that a suspect they have arrested and charged with "terrorist murder" is the man in the footage.
Half a dozen people have been charged in Belgium following Tuesday's attacks on the airport and the metro. The death toll rose to 35 on Monday, excluding the two airport bombers and a third who blew himself up on a rush-hour train.