A nail bomb and an Islamic State flag have been found during a counter-terror raid in Brussels.
Police said they had found the nail-filled explosive as well as "chemical products” at a house in the Brussels neighbourhood of Schaerbeek.
Anti-terror squads are mounting raids across the city in the wake of the deadly blasts at the city's main airport and a metro station which killed at least 34 on Tuesday morning.
A huge manhunt has been launched to find a suspect who was pictured at the airport shortly before the explosions, along with two other men believed to have blown themselves up.
The man on the right, wearing light clothing and a hat, is believed to be on the run following the bombings.
Belgian prosecutors said the search at the house in Schaerbeek “led to the discovery of an explosive device containing among other things nails.”
Islamic State claimed responsibility for the Brussels attacks, saying in a post on the group's Amaq news agency that its extremists opened fire in the airport and "several of them" detonated suicide belts.
It said another suicide attacker struck on the metro.
Authorities found and neutralised a third bomb at the airport once the chaos after the two initial blasts had eased.
Belgian authorities said there was no immediate evidence linking the attacks with Salah Abdeslam, a key suspect in the Paris attacks last Novermber who was arrested in Brussels on Friday.
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