Around a dozen people, including children, were also injured during the overnight Sunday to Monday air raids. Some of them are in critical condition.
Witnesses say two mosques at Beit Hanun, in the north of the Strip, and in Gaza City as well as a house in central Gaza were destroyed in the raids.
Another attack on the Rafah border crossing also left some Palestinians injured.
A doctor at the al-Shifa hospital has told Press TV that Gaza is suffering from a shortage of medicine.
The overall number of Palestinians killed since July 8, when the Israeli military attacks on Gaza began, now stands at 2,122. Nearly 570 children are among the dead. More than 10,800 have also been injured.
The UN says more than 80 percent of casualties of the Israeli attacks have been civilians.
Meanwhile, Palestinian resistance fighters in Gaza continued to fire rockets at Israel in retaliation for Tel Aviv’s onslaught against the besieged territory.
Palestinian fighters targeted several Israeli cities and communities including Tel Aviv, Nahal Oz, al-Quds (Jerusalem), Ashkelon and Kissufim.
At least 7 Palestinian rockets hit Eshkol area within 15 minutes. Five Israelis were wounded by mortar shells in Sha’ar HaNegev in southern Israel. Two of them are in critical condition.
Israeli officials also confirmed that several people had been injured in Be’er Sheba, one of them critically. The Israeli army says nearly 120 rockets were fired into Israel on Sunday.
Tel Aviv says 68 Israelis have been killed in the conflict so far, but Hamas puts the number at more than 150.