Police and social workers have apologised for not protecting vulnerable schoolgirls who were sexually abused and exploited by a paedophile ring.

The admissions of failure, which saw the girls being drugged and raped when they were supposed to be in the care of the authorities, came as a gang of men were found guilty of a catalogue of offences including rape, trafficking and organising prostitution over eight years involving girls as young as 11 in the Oxford area.

Two sets of brothers, Akhtar Dogar, 32, and Anjum Dogar, 31, and Mohammed Karrar, 38, and Bassam Karrar, 33, were convicted along with Kamar Jamil, 27, Assad Hussain, 32, and Zeeshan Ahmed, 27.

Fighting broke out in the dock at the Old Bailey after two other defendants - Mohammed Hussain and a man who cannot be named for legal reasons - were cleared.

The seven men found guilty of offences against the six girls were remanded in custody for sentencing next month.