A Hamas supporter was killed in a firefight early Thursday, and the Islamic group alleged he was gunned down by activists of the rival Fatah Party during an election dispute. Hamas and Fatah activists were hanging election posters in Gaza City when the dispute erupted, said Sami Abu Zuhri, a Hamas spokesman. A firefight erupted, and 24-year-old Rami al-Dalou, a Hamas supporter, was killed, said Abu Zuhri. Palestinian security officials confirmed the death and said they were investigating. Abu Zuhri accused the Palestinian Authority of doing nothing to enforce the law, and demanded the arrest of the gunmen. Hamas is expected to make a strong showing in January 25 parliament elections. The corruption-tainted Fatah, which dominated Palestinian politics for four decades, braces for a major drubbing.