TEL AVIV, Israel — The Israeli military Saturday issued evacuation orders in Gaza City, and urged Palestinian civilians to move to the south of the Gaza Strip, where it said it was designating a humanitarian area. Aid organizations said such an exodus could worsen the humanitarian crisis in the territory.

The Israeli military warned that it planned to strike two high-rise buildings in Gaza City and ordered people inside them and in nearby tents to leave. A short time later, it said it had attacked one of the towers.

A military spokesperson said the buildings were targets because of Hamas activity inside or near them. Hamas denied those accusations and said both buildings had been residential towers. It was unclear whether people had been killed or injured in the strike.

The evacuation o

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