Israel said Sunday that it killed a senior Islamic Jihad commander in a crowded Gaza refugee camp, the second such targeted attack since it launched its high-stakes military offensive against the militant group just before the weekend.

The Iran-backed militant group has fired hundreds of rockets at Israel in response, and the risk of the cross-border fighting turning into a full-fledged war remained high.

Gaza's ruling Hamas group, which fought an 11-day war with Israel in May 2021, appeared to stay on the sidelines for now, possibly because it fears Israeli reprisals and undoing economic understandings with Israel, including Israeli work permits for thousands of Gaza residents, that bolster its control.

The Islamic Jihad commander, Khaled Mansour, was killed in an airstrike on an apartment building in the Rafah refugee camp in southern Gaza late Saturday.

Two other militants and five civilians were also killed in the attack, bringing the Palestinian death toll to 31 since the start of the Israeli offensive on Friday. Among the dead were six children and four women. The Palestinian Health Ministry said more than 250 people were wounded since Friday. Israel says some of the deaths were caused by errant rocket fire, including one incident in the Jebaliya refugee camp in northern Gaza in which six Palestinians were killed Saturday. On Sunday, a projectile hit a home in the same area of Jebaliya, killing two men. Palestinians held Israel responsible, while Israel said it was investigating whether the area was hit by an errant rocket.

Mansour, the Islamic Jihad commander for southern Gaza, was in the apartment of a member of the group when the missile struck, flattening the three-story building and badly damaging nearby houses.

“Suddenly, without warning, the house next to us was bombed and everything became black and dusty with smoke in the blink of an eye,” said Wissam Jouda, who lives next to the targeted building.

Ahmed al-Qaissi, another neighbour, said his wife and son were among the wounded, suffering shrapnel injuries. To make way for rescue workers, al-Qaissi agreed to have part of his house demolished.