Police have launched an "urgent" search for a missing boy with severe autism. 

James Norris, 16, was last seen at his home in Norbury Crescent, Norbury, at 4pm today.

He has the mental age of five and "may be a danger to himself," police said.

Officers are searching the area.

A Metropolitan Police spokesman said: "He is unaware of where he lives, doesn't know the local area and may be a danger to himself.

"It is unknown what direction he travelled in after leaving home. He does not have access to any money."

James is white, 5ft tall and has short brown hair. He was last seen wearing a blue polo top, blue jeans or trousers, trainers and black glasses.

Anyone with information is urged to call police immediately on 101.