Johannesburg - A woman and her 5-year-old daughter have died after they fell off a six storey building in central Johannesburg on Saturday evening, paramedics said.

The pair was found lying on the sidewalk on Claim Street in Joubert Park around 21:30, ER24 spokesperson Russel Meiring said.

"On assessment, paramedics found that the mother had already succumbed to her multiple fatal injuries. Nothing more could be done for her and she was declared dead."

The child was still alive but had sustained critical injuries, Meiring said.

While she was being treated with advanced life support at the scene, she eventually succumbed to her injuries.

The cause of the incident was unclear.