An Israeli air strike on Gaza on Tuesday evening killed a militant and wounded a father and his two sons, medics and the militant group said.
The strike, east of the central city of Khan Yunis, killed Popular Resistance Committees (PRC) member Khaled Sahmud, 24, after militants fired a mortar round to push back an "Israeli incursion," the group said in a statement.
"The PRC confronted the Zionist forces east of Khan Yunis. They hit several of their soldiers and fired a mortar at a gathering of troops," said the statement signed by the group's military branch, Al-Nasser Salaheddin Brigades.
Witnesses said Israeli troops penetrated 100-200 metres (110-218 yards) into the Palestinian enclave, east of Khan Yunis, on Tuesday afternoon
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Three civilians, a father and his two sons, were wounded in the attack, Gaza emergency services spokesman Adham Abu Selmiya said.
Israeli warplanes bombed a suspected weapons manufacturing site in the central Gaza Strip on Monday night after a rocket was fired from the Palestinian territory.
The new mortar and rocket fire came despite a ceasefire that came into force after a spasm of violence that followed a militant attack in Eilat on August 18, which left eight Israelis dead.
Israel responded with a series of air strikes in Gaza, killing 27 Palestinians, and militant groups in the coastal enclave fired dozens of rockets into the Jewish state.
Israel accused the PRC of being behind the Eilat attack but the group denied it was responsible.