Tents sheltering Palestinians displaced by conflict are pictured in Khan Yunis in the southern Gaza Strip. AFP
"A short while ago, a projectile that was launched from Gaza City toward the area of Nahal Oz was identified," an army statement said, referring to a community near the Gaza border.
"An attempt was made to intercept the projectile, and the results are under review," it added.
No group immediately claimed responsibility for the launch.
In recent weeks, the Israeli army has launched a heavy air and ground assault on Gaza City, the territory's largest urban centre.
"The bombing is intense -- from warplanes, tanks, and constant gunfire from drones," Saja Al-Kharoubi, a 26-year-old resident of the city's Al-Daraj neighbourhood, told AFP.
"People are being forced to flee, but where can we go? We have no money, not even for transportation. The entire situation is dangerous everywhere."
AFP footage showed plumes of smoke rising over Gaza City on Monday as Palestinians carrying their belongings fled southwards.
The occupation military said on Sunday that more than 550,000 people had so far fled the city. The UN in late August estimated there were about one million people living in the area.
In his Rosh Hashanah message marking the Jewish new year, Israeli Prime Minister Benjamin Netanyahu vowed to continue "prevailing over our enemies" in the year ahead.
"We are determined to achieve all the goals of our war: not only in Gaza, not only in completing the elimination of Hamas, securing the release of our abductees, and ensuring that Gaza will no longer pose a threat to Israel, but also in other arenas," he said in a statement.
The war in Gaza was sparked in October 2023, Israel has killed at least 65,344 people in Gaza, also mostly women and children, according to the territory's health ministry, whose figures the United Nations considers reliable.
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