A police sergeant has been rushed to hospital after falling from railings during a stand-off with a woman in south London.

The male officer fell from the ground floor railings into a basement area in Harleyford Road, near the Kia Oval cricket ground.

Police had been called at around 11.35pm on Wednesday night over concerns about the welfare of a child.

When they arrived the woman had climbed onto the roof while refusing to come down.

The road remained closed throughout Thursday as a police negotiator continued to talk the woman down.

On Thursday afternoon police said the woman was still on the top of the building as the stand off went into a 15th hour.

The stricken officer was taken to a south London hospital by the London Ambulance Service where he remains in a serious but stable condition.

A Met Police spokesman said: "Police in Lambeth were called to Harleyford Road, Oval, at 11.36pm on Wednesday following concerns for the welfare of a child.

"Officers attended and found a woman on scaffolding outside her window. The woman then made her way to the roof.

"A police negotiator is on scene.

"A uniformed police sergeant was injured at the early part of this incident after falling from ground floor railings.

"The officer was taken by London Ambulance Service to a south London hospital where he remains in a serious but stable condition."

The woman remained on the roof on Thursday morning.