Military observers told the Haaretz newspaper the shelling did no damage and hurt no one.
In the wake of the mortar fire, the Israeli Defense Ministry closed the Kerem Shalom crossing until further notice. Dozens of aid trucks were reported prepared to deliver humanitarian supplies to Gaza while waiting at the crossing.
Palestinians said the Israel Air Force dropped thousands of fliers in Gaza, warning residents there to stay away from the border with Israel and to avoid involvement in smuggling.
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