At about 4:30 a.m. local time at least two shells fired from tanks struck the Abu Hussein school in Jabaliya, the most densely populated area of Gaza. Palestinian health officials have confirmed the deaths of at least 15 people, with some outlets reporting as many as 20.
Roughly 3,300 people were in the school during the attack as it was being used as a refugee camp, housing Palestinians displaced by the Israeli military strikes.
"These people were in this school because they'd been told by the [Israel Defense Forces] to leave where they came from."
Turner said he believes "at least three explosive projectiles" struck the school overnight and is confident the strike came from Israel.
"We've been on site, we're gathered evidence, we've looked at the trajectory and we're confident it was Israeli artillery fire."