The Internal Security Forces raided late on Thursday suspected hide-outs, as part of their investigation into the bombing of the Lebanese Army barracks in Ramlet al-Baida. On Thursday at 11 p.m., a suspect threw a hand grenade in Dirani Square toward the zone of the Ein al-Hilweh refugee camp. The zone is located dozens of meters away from the Lebanese Army checkpoint in the neighboring Hay al-Taamir area. The blast did not inflict any human or material damages. The explosion occurred soon after a bomb exploded near an army barracks in Beirut, in the wake of a warning by an alleged Al-Qaeda operative made from a public phone booth located in Ain al-Hilweh, Lebanon's largest refugee camp.Sources familiar with the issue in the port city said the raid targeted various residential apartments and mobile phone shops. Several persons were taken to Beirut for interrogation, the sources said. Security forces raided several suspected hide-outs, including an apartment located on the eastern boulevard of the city next to the ALPHA company, two homes in the old city of Sidon, a third home in the Bustan al-Kabir area, two mobile phone shops on Dellaa street and one library for Islamic studies.