Kenyan capital Nairobi's centre rocked by large blast

A large explosion has hit the centre of the Kenyan capital, Nairobi.

TV pictures showed a fire raging in a badly damaged building. A BBC reporter says 28 people have been taken to hospital with various injuries.

A Red Cross disaster response team has been sent to the scene of the explosion at a shopping complex on Moi Avenue.

Police commissioner Mathew Iteere says it was probably caused by an electrical fault and dismissed fears of a bomb by Somali militants.

"We are able to prove it was not a grenade attack or bomb attack... from the preliminary conclusions we do think it was an electrical fault," he said.

There have been several grenade and bomb blasts in Kenya since it sent troops into Somalia last year to tackle the al-Shabab Islamist militant group.

Al-Shabab has repeatedly threatened to stage revenge attacks against Kenya.

The BBC's Kevin Mwachiro says glass and shoes and clothes from the small shops inside the building have been scattered across the street.

TV pictures have shown people pouring into the streets from nearby buildings to get away from the scene of the fire, the AP news agency reports.

Moi Avenue is a major road which would have been busy during the lunch hour, AP says.

According to an eyewitness, there was a huge blast and debris flew in different directions injuring people in the vicinity, the Nation newspaper reports.

The powerful explosion shook buildings in the surrounding area and the evacuation process began, the Nation says.

BBC News, Africa