RAMALLAH, West Bank - Hamas claimed on Friday that two ex-officers from the rival Fatah organisation were involved in the assassination of a Hamas operative in Dubai, and Fatah shot back by insinuating Hamas members were the ones who collaborated with the killers. The slaying of Mahmoud al-Mabhouh in a luxury Dubai hotel room last month has widely been blamed on Israel's Mossad spy agency but it also has sparked bitter recriminations among the rival Palestinian factions, which have long competed for influence in the Palestinian territories. Dubai police unveiled 11 suspects …quot; 10 men and one woman …quot; who apparently traveled to Dubai on European passports with real names and authentic data, but possibly altered photos. Dubai also said police had two Palestinians in custody for alleged involvement in the murder of al-Mabhouh, whose body was found on Jan. 20. The two were arrested in Jordan shortly after the killing, then sent back to Dubai. A Hamas Web site, the Palestine Information Center, said those two men were former Fatah security officers and current employees of a senior Fatah official, who was not identified. Dubai authorities have not identified the two Palestinians and would not comment Friday.