The mayor of Jabaliya al-Nazla, Mazen al-Najjar, told Al-Jazeera:
70 camps for displaced persons out of 131 camps in Jabaliya municipality sank and collapsed due to heavy rains.
A collapse in the sewage system and sewage overflowing over the tents of the displaced.
Seawater floods toward displacement camps on the beaches and creates a miserable humanitarian situation.
Winter clothes, blankets and necessities for the displaced have sunk, and most families are now sleeping on the streets.
45 houses were destroyed in Jabaliya and its entire population was evacuated without an alternative shelter available to them.
More than 55 mm of rain fell in a matter of hours, exceeding the capacity of the displaced people's tents and the local system to bear.