Update — July 30, 10:45 a.m. ET
The United Nations said at least 15 Palestinians were killed while sheltering at a school used as a refuge in Gaza.
The school's prinicpal, Fayez Abu Dayeh, told the Associated Press the shelling began around 4:30 a.m. local time, and hit two classrooms and a bathroom.
One classroom had its front wall blown out, while another strike left a large hole in a second floor classroom's ceiling. Palestinian health official Ashraf al-Kirdra said an additional 90 people had been wounded.
Reuters reported an Israeli spokeswoman saying Hamas militants were firing mortar bombs from the school's vicinity, and Israeli troops returned fire. The incident is being reviewed. Reporters in the area say the Israeli army denies it targeted the school.
Chris Gunness, a spokesperson for U.N. aid agency U.N. Relief and Works Agency, has condemned the attack in a lengthy series of posts on his Twitter account, summarized below.
Earlier today, the Israeli military tweeted that Hamas have fired more than 2,670 rockets at Israel since the start of the conflict.
So far, some 1,200 Palestinians and 55 Israelis have been killed during the conflict.
This is the second time a United Nations school has been hit during the current Israel-Hamas conflict.
On July 24, another 16 Palestinians were killed in an explosion at a school in Beit Hanoun, with uncertainty surrounding who is responsible.