ANOTHER man has been arrested this afternoon as detectives in Oxford continue to investigate allegations of a child sex exploitation ring in the city involving 11-year-old girls.

The man was arrested just after 1pm and a total of 13 men have now been arrested in Oxford today as part of Operation Bullfinch.

More than 140 police officers have today been involved in the operation which centres on 24 girls from Oxford aged between 11 and 16.

All of those arrested, who are suspected of crimes including causing prostitution of girls under the age of 18, rape and administering drugs with intent to commit rape, are still in police custody.

They are expected to be questioned by detectives until 10.30pm this evening, when some could be released on police bail.

•A 31-year-old man was arrested on suspicion of causing prostitution of girls under the age of 18; rape; and administering drugs with intent to commit rape

•A 29-year-old man was arrested on suspicion of causing prostitution of girls under the age of 18

•A 30-year-old man was arrested on suspicion of causing prostitution of girls under the age of 18; rape; and administering drugs with intent to commit rape

•A 31-year-old man was arrested on suspicion of sexual activity with a child

•A 32-year-old man was arrested on suspicion of on suspicion of causing prostitution of girls under the age of 18 and rape

•A 26-year-old man was arrested on suspicion of rape and grooming

•A 34-year-old man was arrested on suspicion of causing prostitution of girls under the age of 18

•A 23-year-old man was arrested on suspicion of sexual activity with a child and grooming

•A 37-year-old man was arrested on suspicion of causing prostitution of girls under the age of 18; rape; and administering drugs with intent to commit rape

•A 37-year-old man was arrested on suspicion of causing prostitution of girls under the age of 18

•A 21-year-old man was arrested on suspicion of causing prostitution of girls under the age of 18

•A 34-year-old man was arrested on suspicion of causing prostitution of girls under the age of 18 and rape

•A 26-year-old man was arrested on suspicion of sexual activity with a child