A Palestinian man was killed and two others were wounded in a clash between a militant group and a Palestinian security force in a refugee camp in northern Lebanon, officials said Friday. The clash in the Beddawi camp near the northern city of Tripoli erupted when about 13 militants threw a hand grenade and opened fire on a joint Palestinian security force that came to check reports that an extremist group had rented an apartment near the camp's mosque, Palestinian officials said. One militant and two members of the security force were wounded in Thursday's clash, the officials said, speaking on condition of anonymity because they were not authorized to talk to the media. Maher Abdul al-Hadi, one of the two wounded security men, died in hospital Friday, the officials said. Some of the 13 militants were Palestinians but the nationalities of the others were not immediately known. The Beddawi camp, located on the outskirts of Tripoli, 90 kilometers (53 miles) north of Beirut, is home to some 20,000 Palestinian refugees. Islamic militants are believed to have taken refuge in the camp.