Tension was high in the Palestinian refugee camp of Ain el-Hilweh on Saturday following news of the assassination of Fatah official Col. Talal al-Ordoni, a security official said.
"Al-Ordouni was shot dead by two unidentified men while he was walking in the southern part of Ain el-Hilweh," the Palestinian official told Agence France Presse.
"He was accompanied by two bodyguards, one of whom was also killed and the other was wounded."
Voice of Lebanon radio (93.3) said that al-Ordoni was killed by the Jund al-Sham group.
Supporters of Fatah soon opened fire in the air upon hearing the news of his death.
Jund al-Sham has yet to claim responsibility for the assassination, but VDL identified al-Ordoni's shooter as Bilal Badr, a member of the group.