JERUSALEM, Jan. 20 (Xinhua) -- A massive gas explosion in a Jerusalem apartment building killed a couple and their three-year- old son Monday, Magen David Adom (Israel's Red Cross) confirmed to Xinhua.
Some 15 people were injured in the blast, including a 50-year- old woman who was severely wounded, a spokesperson with Magen David Adom said.
The blast caused the collapse of the two upper stories of the three-story building and damaged some cars that were parking nearby.
A spokesperson with the police told Xinhua that the explosion was caused by a leak from a gas container in one of the apartments.
Police have arrested a gas technician who worked at the building the day before. He was called by the neighbors to check what they suspected was a gas leak, but failed to complete his job, police said.
Fire forces told Israel's Ynet news site that there is little doubt the blast was a result of negligence.