GAZA, May 5 (Xinhua) -- Two Palestinians were killed on Sunday afternoon in a fresh Israeli airstrike on al-Bureij refugee camp in central Gaza Strip, medics said, adding that death toll since Saturday has grown up to 12.

Ashraf al-Qedra, spokesman of the Health Ministry in Gaza, told reporters that Mohammad Abu Armanah, 30 years old and Mahmoud Abu Armanah, 27 years old, were killed in an Israeli warplanes airstrike in central Gaza Strip.

Palestinian security sources said the two killed Palestinians are members of the armed wing of the Palestinian Islamic Jihad, al-Quds Brigades.

Earlier on Sunday, five Palestinians were killed in separate Israeli army airstrikes on the Gaza Strip. The Islamic Jihad said that four of the five killed on Sunday are members in its armed wing.

An Islamic Hamas movement member called Hammed al-Khoudari, 32 years old, was killed in Israeli strike while driving his car in central Gaza city.

Israel accused al-Khoudari of conveying money from Iran to the militant groups in the Gaza Strip, mainly to Hamas and Islamic Jihad.

The Health Ministry in Gaza said in a press statement that 12 Palestinians had been killed since Saturday, when a new wave of tension broke up between Israel and militant groups in the Gaza Strip.