Lebanese soldiers stationed outside a Palestinian refugee camp in south Lebanon opened fire late Sunday on a car they suspected of carrying gunmen. Two men in the car were taken for treatment of gunshot wounds, a third was arrested, security officials said. The shooting occurred two days after suspected Palestinian militants used hand grenades to attack a Lebanese army checkpoint on the fringe of the Ein el-Hilweh refugee camp near the southern port city of Sidon. Officials said the soldiers opened fire when the car refused orders to stop. The army said it was investigating the incident. The largest of Lebanon's 12 Palestinian refugee camps, Ein el-Hilweh has witnessed years of bombings, assassinations and shootings as rival factions vie for control. The camp is also believed to be a hideout for many fugitives wanted by Lebanese authorities.