9 March 2013 Last updated at 08:06 ET

CCTV shows 12 men attacking youths in Manchester

Police have released CCTV images of an "unprovoked" attack by 12 men on a group of youths in Manchester.

The men pulled up in three cars next to the group in Briscoe Lane, Newton Heath at 14:20 GMT on 2 March.

A 15-year-old boy suffered a broken arm and facial injuries requiring stitches after being chased and attacked by up to four men.

A 15-year-old girl was hit in the face and suffered a fractured cheekbone and other facial injuries, police said.

The men then got back in their cars - a silver Peugeot 306, a black Volkswagen Passat and a dark coloured Vauxhall Astra - and drove off along Briscoe Lane towards Ten Acres Lane, officers said.

A force spokesman said it could be a case of mistaken identity linked to a dispute the previous evening in the Newton Heath area, in which neither victim was involved.

Det Const Paddy Connell said: "The CCTV footage shows a determined effort by a group of men to get at and assault a number of teenagers.

"The boy is slight in build and was chased and beaten by burly men. Their actions were shameless and shocking."