At least seven people were killed and five more injured when an explosion tore through a residential building in Tabriz, in western Iran, early on March 12. The blast, which occurred at around 3 a.m. local time, damaged three buildings and affected around 20 apartments, according to firefighters quoted by the Fars news agency. There has been no official conclusion about the incident, but a firefighting official suggested that a gas leak was the likeliest cause. Authorities originally put the death toll at five. To read the original story by RFE/RL's Radio Farda, click here.