The incident happened at around 12:30am on the 28 August last year on board the 250 bus from Streatham to Croydon.
The victims – a man and a woman – were sitting towards the rear on the top deck when the females boarded and sat behind them.
the woman was struck with a bottle by the group and the man was struck with a crutch, resulting in him needing hospital treatment.
Anyone with information on there whereabouts is urged to contact police on 101.
