Cause of Bomb Explosion still unknown

As of this writing, it still now known what has caused the bomb explosion.

Initial report states that it might caused by a LPG tank from a restaurant. The restaurant is said to have frequent problem with gas leak. But police have reported that the only restaurant in the area of the explosion seen to be untouched thus discounting the possibility of the gas leak. However, police are still determining the root cause of the bomb.