A factory explosion in the Lebanese capital on Monday killed four people, the official National News Agency reported. The blast happened inside a factory in the Burj al-Barajneh area in Beiruts southern suburbs, the NNA said. It did not specify the cause of the blast, but local media said a water heater had exploded. Local television stations broadcast footage showing damage to vehicles parked outside the factory, and a video circulating on social media appeared to show three bodies on the buildings blood-soaked floor. AFP could not independently verify the authenticity of the footage.