Ma'an – An explosion rocked the headquarters of the Hamas-affiliated Al-Qassam brigades in western Gaza City causing a number of casualties on Monday evening. Director of the Emergency and Ambulance department in the Palestinian health ministry, Mu'awiya Hassanain, said ambulances sped to the scene to evacuate the wounded. Eyewitnesses told Ma'an that the explosion took place at the headquarters in Al-Mukhabarat Street and that smoke was seen rising from the scene.