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.

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.

Just before midnight, an Israeli airstrike hit a house in Rafah and killed seven people, including children, and wounded several others, Palestinian health officials said. There was no immediate Israeli comment.

Palestinian health officials and Hamas media said an Israeli airstrike had also 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.

In Al-Nusseirat refugee camp in the central Gaza Strip, residents said Israeli planes had bombed and destroyed four multi-storey residential buildings on Tuesday.