A collapsed stair case at a church in South Africa's Johannesburg on Sunday left 94 worshippers injured, the South African Press Association reported, citing Gauteng paramedics. The stair case collapsed shortly after noon and fell upon congregants of the Universal Church of the Kingdom of God on Eloff and Plein streets, said Netcare 911 spokesman Jeff Wicks. Of those injured, 25 were in a serious condition. 'The cause of the collapse is still unknown but is being investigated by the fire service as well as the police services,' said ER24 spokesman Lloyd Krause. The worshippers suffered injuries ranging from minor bruises to fractures. They have been taken to Johannesburg hospital, Helen Josephs hospital and Hillbrow Clinic. 