DNA samples from the body of a 13-year-old girl revealed a "billion-to-one" match with the shop worker accused of killing her, a Court heard.

Police investigating the death of Anum Mahmood, who had come to Bradford for a family party, found blood and semen samples on her body and in the snicket where her half-naked body was found, a jury heard

Bradford Crown Court was told yesterday how samples were sent to forensic experts in a bid to get a DNA profile and compare it to that of suspected killer, Abbas Shabir Ali.

The 20-year-old is alleged to have lured Anum to an alleyway behind Hutton Road, Bankfoot and sexually assaulted her. Then he is said to have strangled the youngster and beaten her to death with a 21kg stone slab.

Forensic scientist Valerie Tomlinson said a semen sample taken from Anum's body produced a full DNA profile which matched Ali's. She said the likelihood of such a match from someone other than a relative was "one billion to one".

Miss Tomlinson said samples had also been taken from Ali's body and spots of blood found on his boots and jogging bottoms. These all produced matching full DNA profiles.

Anum had been visiting Bradford from Birmingham last July . During her two-day stop she stayed with an uncle in Thornton Lane, Little Horton, who lived next door to Ali.

In a video interview played to the court, Anum's ten-year-old cousin Naila Ali told how she had seen Ali outside his workplace, Awami Foods in Broadway Avenue, from their bedroom.

She said: "She saw him and said she liked him. The next day she said she wanted to go and see him."

Naila said Anum twice walked past him while she watched from the bedroom to see if Ali had noticed. She said the 13-year-old was "excited" that he had watched her and went out for a third time without Naila looking.

Witness Jahnzeb Ayub said he had known Ali for ten years since they both attended Priestman Middle School. He said he saw Ali walk along Hope Avenue, by his house where he turned and beckoned to someone.

Mr Ayub said: "Shortly afterwards a lass walked up."

Around 20 minutes later Mr Ayub saw Ali run past in the opposite direction, this time alone, he said.

Later, a friend alerted him to the body and he said: "I recognised the body by the clothing she had on," said Mr Ayub. "It was the lass that went up with Abbas Shabir."

Johnathan Foster QC, defending, asked Mr Ayub if he had made a false connection between the pair "I saw what I saw with my own eyes," he replied.

Ali, of Thornton Lane, denies murder. The case continues.