Brussels, March 23 () - Key suspect over the Brussels Zaventem airport attack has been arrested, according to Belgian media.

CCTV has released a picture showing the brothers Khalid and Brahim el-Bakraoui, who have allegedly bombed the airport. The third suspect in the right of the footage, Najim Laachraoui, was detained on March 23 according to Belgian media quoting judicial sources.

Terror attack in Brussels have left 34 killed, while 250 were wounded at the airport and another metro station on March 22.

Belgium have announced three days of national mourning after the deadly bomb attacks which struck the heart of European Union.