Israeli forces battled Hamas fighters in the narrow alleyways of Jabalia in northern Gaza on Friday in some of the fiercest engagements since they returned to the area a week ago, while in the south militants attacked tanks massing around Rafah.

Residents said Israeli armor had thrust as far as the market at the heart of Jabalia, the largest of Gaza's eight historic refugee camps, and that bulldozers were demolishing homes and shops in the path of the advance.

"Tanks and planes are wiping out residential districts and markets, shops, restaurants, everything. It is all happening before the one-eyed world," Ayman Rajab, a resident of western Jabalia, said via a chat app.