An Israeli tank shell hit and badly damaged a house in the Gaza Strip at dawn on Saturday, witnesses and a Hamas security official said.
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No one was wounded in the explosion near the Shejaya area east of Gaza City, they said.
The Israeli military had no immediate comment on the claim, saying only that a flare had been fired in the sector.
The Abu Ali Mustafa Brigades, the armed wing of the leftist Popular Front for the Liberation of Palestine (PFLP), meanwhile issued a statement saying it fired four mortar rounds into Israel overnight.