Predawn Israeli strikes in the southern Gaza city of Rafah killed "around 100" people on Monday, the territory's Hamas-run health ministry said in a statement.

The statement revised upward the ministry's earlier toll of 52 people killed in the strikes on the city along the Egyptian border.

AFP journalists and witnesses heard an intense series of strikes and saw smoke billowing above the city, which now hosts more than half of Gaza's total population after they fled bombardment elsewhere on the Strip.

The strikes hit 14 houses and three mosques in different parts of Rafah, according to the Hamas government.

The Israeli military said in a statement on Monday that it had "conducted a series of strikes on terror targets in the area of Shaboura in the southern Gaza Strip", adding that the strikes had concluded.

Israeli Prime Minister Benjamin Netanyahu has ordered his army to prepare a ground offensive on Rafah, Gaza's last major population centre that troops have yet to enter after Hamas's October 7 attacks sparked the war.

About 1.4 million Palestinians have crowded into Rafah, with many living in tents while food, water and medicine are becoming increasingly scarce.