A series of Israeli strikes targeting a senior Hamas commander in the northern Gaza Strip left scores of dead and wounded in a crowded refugee camp Tuesday as Israel expands its assault by air and land. The Gaza Health Ministry and the director of Gaza’s Indonesian hospital said hundreds of people were killed or injured in the attack.

Palestinians carried away the injured and dead on blankets and mattresses in the densely packed Jabalya refugee camp. The Israel Defense Forces (IDF) said a senior Hamas commander, Ibrahim Biari, was killed in the strikes.

The blasts left a deep crater and crumbled buildings. Mahmoud Bassal, a spokesperson for the Palestinian Civil Defense emergency services, said about 20 buildings were destroyed. The breakdown of dead and wounded was not immediately clear amid ongoing rescue efforts.