A 15-year-old boy was robbed at Trafford Bar Metrolink, Stretford, on August 2 at 8.20pm.
The teenager was stood with a friend when he was approached by three men, one of whom asked him if he had anything for him.
The victim replied nothing, but the man took his mobile phone from his pocket.
He was then asked what else he had and was threatened before the offender realised he was being watched by passersby. The three men then walked away…..
…..All three men were black and had their faces covered.