A bomb in the southern Lebanon city of Sidon killed an official from the Palestinian Fatah movement on Tuesday, an official from the group said.
The man was identified as Fathi Zaydan, a Fatah official responsible for the Palestinian camp of Mieh Mieh in Sidon.
Mieh Mieh camp, 4 km east of Sidon, is home to 5,250 Palestinian refugees, according to the UN Relief and Works Agency (UNRWA), which aids Palestinian refugees across the region.
The Associated Press reported the a one kilogram bomb was placed under the driver's seat inside the BMW sedan. The body was thrown from the vehicle, and limbs were see nearby.
A security source told the AP that a Syrian worker who was walking by was also killed in the blast.
Fatah officials speaking on Lebanese television called for a meeting of Palestinian factions in order to tighten security in the Mieh Mieh camp.
General Sobhi Abu Arab, chief of Palestinian National Security Forces in Lebanon, said the incident was "a criminal work that is seeking to ignite the situation at Ain al-Hilweh."
"Our stance is clear. We met with senior officials at the Palestinian embassy and we will continue our endeavors to maintain the situation in Palestinian camps," he said.
Abu Arab did not place blame for the assassination on any faction, saying he wanted to wait until the investigation was complete to determine who was responsible.
There have been skirmishes involving automatic weapons and grenades in Ain al-Hilweh between rival Palestinian and Islamist factions over the past few weeks. The camps is home to several extremist militant groups, such as Fatah al-Islam and Jund al-Sham, which are both classified as terrorist groups in Lebanon.
The AP reported that three men dead and nine others were wounded in recent clashes between Fatah and Jund al Sham, but that last week the Palestinian factions in Ain al-Hilweh agreed to a ceasefire.