Brussels

Police officers fired at a car in the Mollenbeck district of Brussels and called for sappers after the driver said explosives were in the car, Belgium's federal prosecutor's office were quoted by Reuters.

Paris attacks suspect Mohamed Abrini was arrested on April 8, a police source told AFP after a Belgian television station said he was detained in a Brussels district.

The two brothers who blew themselves up in the deadly train and airport attacks in Brussels were known by police for serious crimes and are linked to last November's Paris massacre.

Khalid and Ibrahim El Bakraoui are Belgian nationals with major convictions "not linked to terrorism," federal prosecutor Frederic Van Leeuw said at a dramatic news briefing on March 23.

Bulgaria advised on Tuesday its citizens travelling to Belgium or staying there to be vigilant regarding potential terrorist attacks.