JERUSALEM — The Israeli military said Saturday that it had fired on a vehicle in the northern Gaza Strip a day earlier, saying the car had crossed a demarcation line where Israel’s forces have withdrawn to since last week’s ceasefire.

At least nine people were killed, including four children, according to Gaza’s Civil Defense emergency service, which is part of the Hamas-run Interior Ministry.

A Gaza City resident, Mohammad Abu Shaban, said that his sister was traveling in the vehicle and that she and at least three of her children had been killed, along with her husband. He said he had identified their bodies at a hospital in the city Saturday morning before their funeral.

In a statement, the Israeli miliary said that troops first fired warning shots at what it described as a “suspicio

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