A teenager has admitted a series of sex offences against younger boys over a six-month period last year.

The 14-year-old, who lives in the Keighley area but cannot be named for legal reasons, changed some of his pleas on the second day of his trial at Bradford Crown Court.

He had originally denied 14 charges of rape, one of causing a child to engage in sexual activity and of sexual assault.

But after the court heard evidence from two of his accusers he entered guilty pleas to raping two boys aged under 13.

He also admitted sexually assaulting a third boy and a similar charge involving the youngest boy, who was only eight at the time.

Judge Roger Scott then discharged the jury and told the defendant, who sat with his mother and grandmother, that his case was being adjourned for the preparation of a pre-sentence report by the probation service. "You are going to have to come back here to see me for sentence," the judge added.

"I have absolutely no idea what the sentence is going to be - I haven't really thought about it, so technically speaking all options are open to me, including a supervision order or locking you up. I simply don't know what I am going to do."

Judge Scott told him that within the next three days he would have to register with the police as a sex offender and granted him conditional bail.

Opening the trial on Tuesday, prosecutor Gerald Hendron told the jury that the four complainants, who are now aged between nine and 13, were friends of the accused and three had stated he had sex with them As a result, he faced seven charges of rape, plus seven alternative charges of raping a child under the age of 13.

The incidents allegedly took place between July and December last year at the defendant's home or inside a hut or den at a nearby park and on one occasion inside a shed where they were sheltering from the rain, said Mr Hendron.

The allegations came to light in December when one boy spoke to his parents and the police were called in.