Israeli tanks pushed back into parts of the northern Gaza Strip on Tuesday which they had left weeks ago, while warplanes conducted air strikes on Rafah, the Palestinians’ last refuge in the south of the territory, killing and wounding several people, medics and residents said.

Residents reported an Internet outage in the areas of Beit Hanoun and Jabalia in northern Gaza. Tanks advanced into Beit Hanoun and surrounded some schools where displaced families have taken refuge, said the residents and media outlets of the militant Palestinian group Hamas.

“Occupation soldiers ordered all families inside the schools and the nearby houses where the tanks had advanced to evacuate. The soldiers detained many men,” one resident of northern Gaza told Reuters via a chat app.

Beit Hanoun, home to 60,000 people, was one of the first areas targeted by Israel’s ground offensive in Gaza last October. Heavy bombardment turned most of Beit Hanoun, once known as the basket of fruit because of its orchards, into a ghost town.

Many families who had returned to Beit Hanoun and Jabalia in recent weeks after Israeli forces withdrew, began moving out again on Tuesday because of the new raid, some residents said.

Palestinian health officials said an Israeli strike had killed four people and wounded several others in Rafah, where over half of Gaza’s 2.3 million people are sheltering and bracing for a planned Israeli ground offensive into the city, which borders Egypt.

Later on Tuesday, Palestinian health officials and Hamas media said an Israeli air strike had killed 11 Palestinians, including children, in the Al-Maghazi refugee camp in the central Gaza Strip. The Israeli military did not immediately respond to a Reuters request for comment.

“My brothers were sitting by the door, my brother was injured, and his cousin too, and I lost my son, I do not have a house, nor a husband, nor anything anymore,” said Wafaa Issa al-Nouri, whose son Mohammad and husband were killed in the strike.