Israeli military officials say its troops have fired into northern Gaza, after withdrawing from the territory earlier this month.
The military says Tuesday night's offensive is in response to Palestinian rocket fire.
Following the Israeli artillery fire, a leader of Islamic Jihad said the militant group would halt rocket attacks against Israel.
In other developments, the Palestinian Authority says shrapnel found in the bodies of people killed in a blast at a Hamas rally last week came from the militant group's own homemade (Qassam) rockets.
That conclusion was contained in a forensic report issued on Tuesday by the Palestinian Interior Ministry.
The blast at a Gaza refugee camp Friday killed 21 people. Hamas and Islamic Jihad blamed Israel and launched retaliatory rocket attacks on southern Israel, triggering a wave of Israeli airstrikes and the arrests of about 380 people in the West Bank.