After the collapse of yesterday's ceasefire, at least 50 people were killed today in Israeli strikes, most of them in Rafah, raising the Palestinian death toll to 1,655, mostly civilians, Gaza health officials said.
They said 8,900 Palestinians have been injured so far.
Meanwhile, the Israeli army today told residents of Beit Lahiya town in northern Gaza that it was "safe" to return to their homes, as witnesses said troops were seen withdrawing from the area.
It was the first time troops had been seen pulling back since the start of the deadly 26-day conflict, which has forced up to a quarter of Gaza's population into exile.
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"Messages have been conveyed to residents of the northern Gaza Strip that they may return to the Beit Lahiya area," an army statement said, with a spokeswoman indicating the message had been conveyed to authorities in the coastal strip.
Witnesses in Al-Atatra, which is part of Beit Lahiya, reported seeing troops pulling back, in a move mirrored in the south, where residents said the soldiers had withdrawn from villages east of Khan Yunis, close to the Israeli border.
Massive Israeli artillery shelling yesterday killed 160 Palestinians across Hamas-ruled Gaza following the collapse of a 72-hour ceasefire just two hours after it began.
Israel blamed Hamas for the breakdown of the ceasefire, accusing the Palestinian militant group of killing two Israeli soldiers and taking another hostage in Rafah area in southern Gaza after the start of the truce.
Its armed wing - Ezzedine al-Qassam Brigades - said it had no information on the whereabouts of the captured Israeli soldier and he might have been killed in Israeli shelling.
Several rockets were fired into Israel today.
The Israeli army said 51 rockets and mortar rounds hit Israel yesterday, with another nine rockets shot down by the Iron Dome missile defence system.