At least 20 Palestinians were killed early Tuesday in two separate Israeli army's attacks in northern Gaza, sources told Anadolu.

According to a medical source, 12 Palestinians were killed and others injured in Israeli artillery shelling on the displaced in Beit Lahia.

Witnesses said drones are surrounding the Khalifa Bin Zayed School, with officials threatening to kill if they do not evacuate.

Another medical source said eight more Palestinians were killed in Israeli artillery shelling on Al-Alami area in the Jabalia refugee camp.

The Gaza civil defense on Monday said more than 600 people have been killed since the start of Israel’s ongoing military offensive in the northern Gaza Strip over two weeks ago.

The UN agency for Palestinian refugees (UNRWA) said Monday that Israel was banning the entry of humanitarian aid into northern Gaza.

Israel, which has killed more than 42,600 people in the Palestinian enclave since the Oct. 7, 2023 Hamas attack, laid siege to northern Gaza more than two weeks ago, resulting in the deaths of hundreds of civilians.

It also demanded the evacuation of civilians from large swaths, and restricted entry of essential supplies, including food and fuel to the area, according to UN and rights groups.