Police are hunting a gang of girls who bottled two women and a man in separate attacks on a busy train.
All three victims were left injured after the attacks which took place on a train as it travelled between Kent and central London on a Saturday evening.
British Transport Police said the girls were among a rowdy group of around six men and women who started shouting at each other after boarding the train at Slade Green station in south east London just before 6pm on 11 September.
A woman who was also travelling on the train asked the group to "quieten down a little", sparking an attack.
First one of the group barged into her and as the woman tried to flee to another carriage, the gang followed her and launched an attack on her, kicking her in the head and hitting her with glass bottles.
The woman managed to get off the train at Erith, south east London, with other passengers who gave her first aid before she was taken to hospital, British Transport Police said.
The group stayed on the London-bound train and were seen on the same service more than an hour later travelling back to Dartford just before 7pm.
The gang started verbally abusing a couple on the train, then a girl from the group attacked the woman with a wine bottle before the rest attacked both her and the man.
Both victims were pulled to safety by other passengers who were also assaulted by the group, police said.
The victims got off the train at Belvedere station and were treated for face and head injuries at hospital, while the gang stayed on the train.
Police are now looking for the gang and have released CCTV images of people they are looking for in connection with the incident.
A spokesman for British Transport Police said: "Do you recognise these people? Officers investigating two serious assaults on-board trains travelling between Kent and London are today releasing images in connection [with the assaults].
"Officers believe those in the images may have information which could help their investigation."