An Israeli strike killed 31 people in central Gaza Sunday, the Palestinian territory’s civil defence agency said, as US National Security Advisor Jake Sullivan visited for talks on the conflict, AFP reports.

Hamas’s armed wing, the Ezzedine Al-Qassam Brigades, said it was targeting Israeli forces stationed at Rafah crossing — a vital conduit for humanitarian aid that is now closed — with mortar fire.

Israel has also fought and bombed resurgent Hamas forces in northern and central areas of the coastal territory previously considered to be under army control, sparking US warnings that it could become mired in a lengthy counterinsurgency campaign.

In the latest aerial bombardment overnight, Gaza’s civil defence agency said an Israeli strike had killed 31 people and wounded 20 in a home in the central Nuseirat refugee camp.

Israel’s military, which on Sunday reported its aircraft had “struck dozens of terror targets” over the past 24 hours, said it was checking the reports. Witness Yasser Abu Oula told AFP an entire residential complex “was destroyed” and “there are still bodies under the rubble”.