Photo: Reuters
Belgian prosecutors believe they may have found a bomb factory also used as a hideout by one of the jihadists after the Paris attacks, the BBC reports.
Police found traces of explosives, three handmade belts and a fingerprint of fugitive Salah Abdeslam.
The apartment in the Schaerbeek district of Brussels had been rented in a false name that might have been used by a person already in custody.
Islamic State (IS) suicide attackers killed 130 people in the attacks.