Israeli strikes across the Gaza Strip have killed at least 30 Palestinians since Monday night, Palestinian media and medics said on Tuesday as the Israeli army tightened its siege on northern areas of the enclave.

An air strike damaged two houses in the town of Beit Lahiya in northern Gaza, where the army has carried out new operations since October 5 and killed at least 20 people late on Monday, the Palestinian official news agency WAFA and Hamas media said.

The Gaza health ministry did not immediately confirm the toll. Four other people were killed in the central Gazan town of Al-Zawayda around midnight on Monday, medics said.

Palestinian health officials said six people had also been killed in two separate Israeli air strikes in Gaza City and Deir Al-Balah in the central area of the narrow enclave.

The Israeli military said, without giving details, that its forces had "eliminated terrorists" in the central Gaza Strip and Jabalia area. Israeli troops had also located weapons and explosives over the past day in the southern Rafah area, where "terrorist infrastructure sites" had been eliminated, it said.

Palestinians said the new attacks and Israeli orders for people to evacuate were aimed at emptying two northern Gaza towns and a refugee camp to create buffer zones.

Israel says its forces have killed hundreds of Palestinian gunmen and dismantled military infrastructure in Jabalia in the past month.

More than 43,300 Palestinians have been killed in more than a year of war in Gaza, the authorities in Gaza say, and much of the territory has been reduced to ruins.

The war began after Hamas-led militants attacked Israel on October 7, 2023, killing some 1,200 people and taking 251 hostages back to Gaza, according to Israeli tallies.