hospital roof collapses injuring several in South Africa

Rescue workers in Johannesburg are using heavy lifting
equipment and sniffer dogs in the search for people 
believed to trapped under rubble after a roof collapsed at a major hospital.

The roof caved in at the reception area of the Charlotte Maxeke state hospital as construction work was under
 way to seal a leak, officials say.

At least 10 people have been treated for minor injuries, including patients.

Heavy rain has hampered rescue work at the hospital,
 one of country's biggest.

Emergency services' teams were still assessing whether anyone was trapped in the rubble.

One worker said: "I heard people screaming, saying:
'There are people under the rubble'."

Another said: "There was a noise, I saw rubble and dust
everywhere. I don't know how many people are under there."

Stones had been moved onto the section of roof that later
collapsed, the main opposition Democratic Alliance party 
said.

But a statement from the provincial department of health
 in Gauteng province said the cause of the collapse was still
unknown.