Israel and Palestinian groups are blaming each other for violating a 72-hour truce that broke down just hours after coming into effect on Friday.
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An Al Jazeera team arrived at Khuzaa in Khan Younis to find people retrieving decomposing bodies from homes.
Witnesses said six youths had been taken to a house and executed by Israeli forces. The bodies were left there for several days.
One man said: "It is a mass execution of six Palestinian youths who were brought to this bathroom. Look at the gunshots on the wall."
Source: Al Jazeera