The Israeli military is still trying to determine if shells it fired killed seven members of a Palestinian family picnicking on a beach in Gaza on Friday.
The military has accounted for five of the six shells it fired into Gaza, and said they didn't kill the family.
But investigators aren't sure what happened to the sixth shell. It may have fallen among the Ghalia family.
Israeli Prime Minister Ehud Olmert on Sunday said he was sorry about the deaths. But chief of staff Dan Halutz said an expression of regret does not mean Israel is taking responsibility, because the investigation is continuing.
A Palestinian security source said Sunday that Hamas operatives had cleared the debris from the explosion which killed seven Palestinian civilians on Friday in order to frustrate the IDF's attempts to investigate the incident.
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