A teenager from Hounslow has been missing for more than four days.
Ayun Gamu was last seen leaving her house in the Heston area on Sunday (August 21) at 10am.
The 17-year-old has not been heard from since, and police say they are concerned for her welfare.
Ayun is 5ft6 with a slim build and shoulder-length dark hair.
She was wearing light blue jeans, a black T-shirt and black boots, and was carrying a dark handbag, when she disappeared.
Police say she is known to frequent the areas of Heston and Hounslow, especially the neighbourhood around the Heston Farm estate.
Anyone with information is asked to call police on the non-emergency number 101, or the charity Missing People on 116000.
You can also call Hounslow CID on 0788 4476 182, quoting the reference code 16MIS036941.