One person was killed and four injured in an explosion in the Palestinian Ain Al-Helwa refugee camp in southern Lebanon on Tuesday, official news agency reported. The explosion took place during a funeral of a Palestinian in the camp, killing the person who planted the explosive device and wounding four others including Mahmoud Abdulhameed Essa, the military official in Fatah, the agency added. The funeral was of a Fatah member who was shot dead by an unknown gunman two days ago, triggering tension in the camp. Ain Al-Helwa is the largest Palestinian camp in Lebanon, which has 12 camps, with more than 70,000 people