Police are still hunting a man who sexually assaulted a 10-year-old boy in an Oxford alleyway.

The Oxford Mail teamed up with Thames Valley Police to produce posters of an e-fit of the attacker, who approached the boy at 4.35pm on April 26.

The incident happened as the youngster was walking along an alley that leads into Aldbarton Drive, Barton. The boy screamed and ran away before raising the alarm.

The attacker is described as middle-aged, 6ft tall and of medium build, with greyish, brown short hair. He was wearing a dark zip-up jacket.

Two young brothers were approached by a middle-aged man at a bus stop in London Road, Headington, later the same day. He invited them to catch the same bus as him but they refused.

Following the publication of the posters, and appeals in the Oxford Mail, several people contacted police.

Dc Marc Tarbit, of Oxford CID, said: "We have had a fairly good response to the posters and been given four names."

The people named were all arrested but released without charge.

Pc Vicky Pilley, who has taken over the case, said: "We are still following up a number of leads and are open to any information from the public."

Anyone with information can call 08458 505505 or Crimestoppers on 0800 555111.