Gunmen opened fire on security forces in a Palestinian refugee camp in north Lebanon in a short battle that left three people wounded Thursday, Palestinian officials said. The clash erupted when a combined squad of Palestinian and Lebanese security forces came to investigate reports that a suspicious group had entered the camp and hired an apartment near the mosque in Beddawi camp near the city of Tripoli, the National News Agency reported. The battle involved automatic weapons and rocket propelled grenades, the official agency reported. The news agency said the number of casualties was not known but could include fatalities. Palestinian officials reached by phone said three people were wounded and taken to the camp's hospital. The officials, who spoke on condition of anonymity as they were not authorized to talk to the media, said the casualties included one member of the security forces.