Israeli troops were today accused of evacuating more than 100 Palestinians to a house in Gaza then shelling it, killing 30 of them.
The UN Office for the Co-ordination of Humanitarian Affairs said the incident happened on January 4, the day after Israel began its ground offensive against Hamas militants.
Based on eyewitness testimony, the account added details to an incident previously reported by the Associated Press news agency and an Israeli human rights group.
The UN agency said 110 people were in the house and 30 people were killed, far higher figures than in other accounts.
It said a Red Cross medical team was blocked from reaching the area until three days later. Rescuers were allowed in on foot, without ambulances.
The Israeli military refused to comment on the report today.