From your own link:
The Khan Yunis refugee camp was established after the
1948 Arab–Israeli War, accommodating roughly 35,000 Palestinian refugees, who
fled or were expelled by Zionist militias from their homes.
On 3 November 1956, the camp and city of Khan Yunis were occupied by the Israel Defense Forces. In the ensuing operation, about 275 Palestinians were killed by Israeli forces, including 140 refugees from the camp, in what became known as the
Khan Yunis massacre. Residents state that most of the casualties occurred after hostilities had ended, with the army searching houses for suspected armed men. However, Israeli authorities stated the casualties were a result of resistance by the camp's residents.
[3]
According to UNRWA,
many of the camp's residents have lost their homes as a result of operations by the Israeli military. UNRWA began reconstruction efforts in the early 2000s, but
work has largely been halted due to the blockade imposed by Israel on the Gaza Strip following the
Hamas takeover of the territory. UNRWA says that at least 10,000 homes need to be constructed.
[2]