Kenyan officials say at least seven children have died after a classroom collapsed at a primary school in the capital Nairobi.

The wooden structure at Precious Talent Top School collapsed just minutes after the start of the school day today.

Dozens of people were injured and have been taken to hospital in the city.

Rescuers have reportedly had difficulty getting to the school because of the large crowds that have gathered nearby.

The school’s director, Moses Ndirangu, blamed the collapse on the construction of a nearby sewer, which he said may have weakened the foundations of the building.

But a Nairobi-based architect, Professor Alfred Omenya, told the BBC that the school was poorly built and was a “disaster waiting to happen”.

The Kenyan Red Cross transferred some children to the Kenyatta National Hospital. Two of the injured were reported to be in a critical condition.