BRUSSELS -- An arrest was made Friday morning in the Brussels district of Forest during police probe into Tuesday's terror attacks on the Belgian capital.

Belgium's federal prosecutor has yet to give details of the arrest, which if confirmed, would be the seventh made by the police since the attacks, which killed at least 31 poeple and injured more than 300 others.

On Thursday evening, two people were arrested in central Brussels, one in the nearby suburb of Jette and three others near the federal prosecutor's office, local broadcaster RTBF reported.

Another police raid was launched in the district of Schaerbeek on Thursday evening but no arrests were made, according to Belgian daily newspaper Le Soir. Several witnesses reported hearing an explosion.