A Hamas supporter and another gunman were killed in a drive-by shooting in southern Gaza on Sunday, bringing the death toll in four days of Hamas-Fatah fighting to 27. In all, more than 60 Palestinians have been killed in internal fighting since December, including 26 in the latest round which began Thursday. SundayÂ’s violence began with a blast at the home of a bodyguard to Fatah strongman Mohammed Dahlan. The guard was not in the building, and no casualties were reported. Other clashes took place near security installations in Gaza City, and several Hamas loyalists were abducted in the northern Gaza Strip, Hamas officials said. The violence also spread to the West Bank, where about 15 Fatah gunmen stormed into a West Bank bank and snatched a local Hamas leader, witnesses said. There has been a rash of kidnappings throughout the fighting. In all previous cases, the hostages have been released unharmed relatively quickly. By midafternoon, a lull appeared to be taking hold in Gaza City. The cityÂ’s main marketplace reopened, and people were out and about running errands. Gunmen opened fire on a police station in northern Gaza after sundown, wounding a police officer, security officials said. Also, they said, an intelligence officer and his bodyguard from Fatah were kidnapped. In the southern Gaza town of Khan Younis, a Hamas gunman was shot dead in a drive-by shooting after nightfall, Hamas officials said. A second gunmen was killed later, hospital officials said. His affiliation was not immediately known.