Khan Yunis Municipality spokesman Saib Lakhan told Al Jazeera:
Most of the displaced people's tents were flooded, and rainwater and streams flowed into them from all sides.
A grave danger threatens the lives of more than 900,000 displaced people who are crowded in low-lying areas west of Khan Yunis.
More than 60 centers in the Al Mawasi area are directly and immediately threatened by flooding and the sweeping away of property.
Floods and strong winds damaged dilapidated tents that had not seen maintenance or restoration work for 3 years.
Rescue capabilities are poor, and protecting the displaced from the disasters of the coming winter requires a great miracle.