A convicted child sex offender has been found guilty of grooming a 13-year-old Bradford girl for sex and sexually assaulting her older sister.

Shabir Ahmed was also convicted by a jury at Bradford Crown Court yesterday of nine offences of having child pornography on his computer.

He was acquitted of attempting to pervert the course of justice by telling the girl to drop the court case against him.

Ahmed, 39, was remanded back into custody by Judge Jonathan Durham Hall QC.

The judge said he hoped to sentence him on Tuesday along with a co-accused man who had already pleaded guilty to having a sexual relationship with the schoolgirl.

During Ahmed’s week-long trial, the jury was told he was convicted in 2005 of indecently assaulting a girl aged 13 in his vehicle after she had been drinking alcohol.

His Bradford victim said he gave her vodka at his flat in Windsor Court, Little Horton, Bradford, before having sex with her.

Prosecutor Caroline Wigin said the girl’s adult sister and her aunt saw Ahmed having sex with the girl, who met Ahmed in Lister Park, Manningham, when she was 12.

Her sister was at his flat when she witnessed the sex and her aunt saw Ahmed and the schoolgirl through open curtains.

The girl’s older sister, in her twenties, said Ahmed also sexually molested her at his flat and threatened to petrol bomb her home if she reported what he had done.

She said Ahmed threatened to put sexually explicit film of himself and the schoolgirl on the internet if she revealed the relationship.

Police searching Ahmed’s flat seized his computer and found pictures of naked girls as young as 12 on it.

A police computer expert found that searches had been made on the computer to see if Ahmed was publicly listed as being on the sex offenders’ register following his earlier conviction.

Judge Durham Hall told Ahmed to expect to go to prison.