The Met are searching for a 14-year-old boy who has not been seen since Friday 4 October.
Semi Suka, from Uxbridge, was last seen wearing his school uniform at Uxbridge High School at around 3.15pm on Friday 4 October.
He told friends he was going to KFC in Uxbridge and police think he may have gone into Uxbridge Town Centre.
The school uniform he was wearing consists of black trousers, a white shirt and black blazer with a black and yellow tie. He was also carrying a blue and red bag.
Police want anyone with information on Semi to call Uxbridge Police on 0208 246 1524, the police non-emergency line on 101 or Missing People on 116 000.