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Police are trying to trace the three men pictured in connection with a screwdriver attack on a London-bound train on March 8.

The trio boarded the train in Dartford and then began to mock their victim's accent before punching him in the face and attacking him with the screwdriver in Sidcup station.

The victim was left with a pierced top lip which needed 15 stitches.

He also suffered a cut to his left thigh and a chipped tooth.

The attackers are white men who are believed to be South African.

They are all in their mid-30s, have shaven heads and are about 5ft 8in tall.

Anyone with information about the attack, which happened between 10.30pm and 11pm, should call British Transport Police on 020 7922 6213.