‘This was a deeply traumatic ordeal’

The attack happened in an alleyway in Wilkinson Way, Ealing, near Southfields Recreation Park at around 7.45pm on June 7.

The teenage girl, who cannot be named, was waiting for a 207 bus when she was approached from behind by a man who told her he had a knife.

He took her mobile phone and led her away from the bus stop along High Street towards Shepherds Bush and into Wilkinson Way.

The girl was then slapped across the face by the man, who pushed her against the wall and demanded oral sex.

Ealing Borough Police spokesman Chris Mullally said: "This was a deeply traumatic ordeal for the victim and we are treating this incident very seriously.

"We believe this male may possibly be from the Acton or Shepherds Bush area and may frequent Acton regularly as he had a good knowledge of the area where the incident took place.

"We are anxious to trace him and would ask anyone with information, no matter how insignificant it may appear, to contact us."

Extensive enquiries by police have so far produced no results.

A second man was seen a short time later in the area and although police said he was not in any way connected to the attack they are keen to trace him as he may be able to provide vital information.

The potential witness is black, around 5ft 8in, 20 years old, with large afro-style hair wearing a red sleeveless top with the number 4 on the front and a blue flash down the side.

Police have issued an e-fit image of the attacker who was black, aged between 20 and 25 years old, around 6ft tall, with a large build, muscular arms, with a rash on the back right-hand side of his neck.

He was wearing a grey baggy t-shirt, dark three-quarter-length trousers, black Nike trainers and a very distinctive grey and blue baseball cap with the logo "EROS" on the front.

Police want anyone with information to contact the Sapphire unit at Southall police station on 020 8246 1139 quoting crime reference 2519368/06, or to call Crimestoppers anonymously on 0800 555 111.