At least nine construction workers in Uganda have died after the building they were working on collapsed.
It is not known how many people were working at the building site
The building, which had at least three storeys, was part of a school outside the capital, Kampala.
The BBC's Sarah Grainger at the scene says police, army and workers at the site are using industrial diggers to search for people who may be trapped.
Two years ago, poor construction was blamed for the collapse of church killing 27 people during a service.
Police said then that the planning authorities were responsible for what they called a rampant problem of substandard construction and high levels of corruption meant short cuts were often taken.
Our correspondent says the building is now a heap of rubble, twisted metal and broken timber.
An eyewitness told her that minutes before it collapsed one of the building's pillars began to wobble.
Police spokesman Gabriel Tibayungwa says it is not known how many people were working on the site.
"The foreman is suspected to have died so we have nobody to give us a record of how many people were there," he told the BBC.
Local residents say they are not surprised at the tragedy.
"The kind of materials these people have been using - it is no surprise," said one man near the school.
"We blame our government because it does not take into account what kind of buildings are being built in the city."
Police say the rescue and recovery effort will continue until all survivors have been found and the bodies extracted from the site.