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

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

Dozens of people were injured and have been taken to hospital in the city. Emergency services are at the scene.

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