Adham Abu Selmiya said nine people had been killed in a series of raids across the strip that ended before dawn on Thursday.
Among the dead, at least two were Islamic Jihad militants.
The first attack on Wednesday hit a car in the southern city of Rafah, killing 34-year old Jihad militant Ismail al-Ismar.
Later, medics found the body of Ismail Amum, a 65-year-old civilian who was killed during an earlier raid near Deir al-Balah in central Gaza.
During the evening, the air force struck a target in Gaza City, killing another Jihad militant, 20-year-old Atiya Muqat; one more strike on Rafah killed Hisham Abu Har, a civilian working inside the cross-border smuggling tunnels.
Early Thursday morning, an air strike on a sports hall in the northern town of Beit Lahiya killed civilian Salam al-Masri, and injured another 20, one critically.
Several hours later, 22-year-old Adnan al-Jakhbir, a civilian who was critically injured in Beit Lahiya, died of his injuries, the ambulance service told AFP.
During the afternoon, medics pulled three more bodies from the wreckage of tunnels in Rafah, Abu Selmiya said, naming them as Imad Abu Harb, 32, Rajaa al-Sabhani, 19 and Mohammed Tafesh, whose age was not immediately clear.
None of them were believed to be militants.
Over the same 24 hour period, Gaza militants fired 19 rockets and mortars into southern Israel, lightly wounding an infant, the military said. (*)
Editor: Kunto Wibisono
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