A teenager found guilty of the armed gang rape of a helpless prostitute has been jailed for 12 years.

Jermaine Green's female relatives wailed and shrieked in distress when His Honour Judge Hucker sentenced the 17-year-old after damning his "utter depravity and cruelty" last Friday.

Green a mechanic's apprentice moaned, shook his head and rocked back and forth, saying: "I didn't do it."

But last month a visibly shaken and weeping jury at Kingston Crown Court decided the Wimbledon teenager did commit two counts of robbery and three counts of rape at a Tooting brothel.

He was among a gang of masked men who burst into the anonymous-looking terraced house at 234 Franciscan Road, where foreign women were being forced by ruthless pimps to act as sex workers.

Interrupting a brothel client, they robbed him of his phone and money, and took cash from the brothel's receptionist.

Green and two other men then took one woman to a back bedroom.

One sexually assaulted her with a handgun and even threatened to fire it, before the others took turns to rape her.

Green was found guilty of all the offences "by joint enterprise", but Judge Hucker said he was confident Green was masked man number two.

The rapists were interrupted by armed police arriving, and they fled over back garden fences.

Green and the 16-year-old lookout were found sweating and panting in a nearby garden, and the victim's DNA was found inside Green's underwear.

The lookout who cannot be named but came from Streatham Vale was also jailed on Friday for four years, after pleading guilty to robbery at an earlier hearing.

He had been identified in an ID parade by the brothel's client, who saw the boy cut the phone line to the house in an attempt to prevent police being called.

Judge Hucker told Green, who has been placed on the sex offenders' register, that "the sheer fear and horror engendered by this crime cannot be underestimated," and his actions were "beyond the realms of normal human behaviour".