41 hurt in unexplained Johannesburg blast

An unexplained explosion ripped through central Johannesburg during rush hour Wednesday, tearing through a main road and injuring 41 people, South African officials said.  

Emergency services initially blamed underground gas pipes, but the Egoli Gas company said it was "unlikely" the explosion -- which cracked tarmac and overturned vehicles including minibus taxis -- "was caused by a gas pipeline or leak".