Gaza's ruling Hamas movement delivered death sentences on Sunday to three Palestinians it ruled had taken part in what it said was an Israeli-directed assassination of one of the Islamist group's senior commanders.

A Hamas security court said the three men had confessed to the killing of Mazen Fuqaha, a Hamas military wing commander, who was shot in the head and the chest in his car on March 24 near his Gaza home.

"The field court has sentenced the three convicted of carrying out the crime of the assassination of martyr Mazen Fuqaha to death," said Brig. Gen. Naser Suleiman, chairman of the Hamas-run military judiciary.