I’m guessing their source for these allegations is Hamas.
Gaza: Israeli Soldiers Shoot and Kill Fleeing Civilians – HRW
Israeli forces in the southern Gaza town of Khuza’a fired on and killed civilians in apparent violation of the laws of war in several incidents between July 23 and 25, 2014. Deliberate attacks on civilians who are not participating in the fighting are war crimes.
Seven Palestinians who had fled Khuza’a described to Human Rights Watch the grave dangers that civilians have faced in trying to flee the town, near the Israeli border, to seek safety in Khan Younis. These included repeated shelling that struck apparent civilian structures, lack of access to necessary medical care, and the threat of attack from Israeli forces as they tried to leave the area.
On the morning of July 23, Israeli forces ordered a group of about 100 Palestinians in Khuza’a to leave a home in which they had gathered to take shelter, family members said. The first member to leave the house, Shahid al-Najjar, had his hands up but an Israeli soldier shot him in the jaw, seriously injuring him…
In another incident on July 23, Israeli soldiers fired on a group of civilians who had been told to leave their home in Khuza’a, killing Mohammed al-Najjar, a witness said.
One case illustrates the dangers facing civilians both who remain in place and who heed Israeli orders to leave. On July 25, an Israeli strike killed three civilians – Motassem al-Najjar, 5; Kamel al-Najjar, 62; and Salim Qdeih, around 70 – who were among 120 people sheltering in the basement of a home, witnesses said. Another 15 people were wounded.
Those who had survived the attack on the basement fled after the strike and walked to Khan Younis, carrying white flags and raising their hands when they came across Israeli soldiers. An Israeli missile strike hit one group of them, killing a man and wounding his cousin, the cousin told Human Rights Watch.
Human Rights Watch interviewed displaced residents from Khuza’a in Khan Younis. They said they believed that several hundred people were trapped and unable to leave Khuza’a, and expressed concern that many bodies were left in the rubble after intensive Israeli shelling.
HT: Truth Revolt