Transport police are seeking witnesses to a robbery on the Metro rail network.

A 26-year-old Czech man was approached in Sunderland city centre station by a youth who grabbed his mobile phone from a holder round his neck and ran away.

As the victim gave chase he was impeded on the station stairs by someone thought to be working with the thief.

He was then beaten up by a gang of youths aged between 16 and 19.

It is believed the gang then made their way to the Blue Monkey Club, in the Pallion area of the city.

British Transport Police have appealed for witnesses to the robbery, particularly anyone who may be able to identify the gang involved.

The incident took place at about 11.10pm on Saturday, June 18.

Witnesses are asked to call 0800 405040.