Palestinian sources said at least 29 people were killed Tuesday in a strike on a school being used to shelter displaced people in Gaza, the fourth such incident in four days, with Hamas blaming Israel for the deaths.

Israel’s military told AFP it was checking the latest reports. It has acknowledged carrying out three other strikes since Saturday on Gaza schools being used as shelters.

The strike hit the entrance to Al-Awda school in Abasan, said a source at Nasser hospital in the nearby southern city of Khan Yunis where victims were taken, adding that 29 were killed and dozens wounded.