Nail Bomb And IS Flag Found In Terror Raids

A bomb containing nails has been found along with an Islamic State flag in police raids in Brussels, according to prosecutors.

The discovery was made during a search of an apartment hours after the Belgian terror attacks, which killed at least 34 people .

"The searches that took place in the Schaerbeek (district) found an explosive device containing among other things nails," the federal prosecutor said in a statement.

"Investigators also discovered chemicals and a flag of the Islamic State," the statement added.

:: Terror In Brussels: Live Updates

A series of raids are taking place across Brussels in connection with two bomb blasts at Zaventem Airport and an explosion at Maalbeek metro station.

Belgian authorities have released a photograph showing three suspects caught on CCTV cameras at the airport.

Two men seen in the photograph wearing dark jumpers are believed to have blown themselves up in the terror strike, which began at around 8am local time.

A third man wearing a hat is understood to have fled the airport.

Authorities have issued a wanted notice for the man and anti-terror police are searching the districts of Schaerbeek and Jette.

Belgian media reported that the three suspects travelled to Zaventem Airport by taxi.

The taxi driver remembered where he picked up the men and was able to lead investigators to the house in Schaerbeek, where an IS flag and a nail bomb were discovered.

:: Brussels Terror: How The Attacks Unfolded

Islamic State claimed responsibility for the bombings in a statement released online.

"We promise the crusader alliance against the Islamic State that they will have black days in return for their aggression against the Islamic State," the extremist group said.

The AMAQ news agency, which is affiliated to the jihadist organisation, added: "Islamic State fighters opened fire inside Zaventem Airport, before several of them detonated their explosive belts, as a martyrdom bomber detonated his explosive belt in the Maalbeek metro station."