A group of teenage girls has been accused of wreaking havoc and assaulting commuters on an Adelaide train line.

The group has been threatening and terrorising commuters on the Seaford train line, on the Eyre Peninsula, for the past few weeks.

An Adelaide mother confronted the teenage girls after they allegedly attacked her 17-year-old daughter on Wednesday evening.

She was alerted to the incident after she received SOS text messages from her daughter who said she was being robbed.

‘They were saying give me your bag, give me your phone, give me your glasses,’ the mother told 9News.

‘Grabbed her by the hair, pulled her head backwards and started punching her.

‘As a mother, it makes me feel helpless.’

A group of teenage girls has been accused of wreaking havoc and assaulting commuters on an Adelaide train line (pictured, footage of

A mother was alerted to the incident after she received SOS text messages (pictured) from her daughter who said she was being robbed

A SA Police spokesperson confirmed police were investigating the alleged assault.

‘Just after 6.15pm Wednesday 1 May, a teenage girl was assaulted on the Seaford Line train by a group of girls unknown who attempted to steal her bag and phone,’ the spokesperson confirmed.

‘The female victim received minor injuries.’

The spokesperson said police are reviewing CCTV footage, and all three suspects had long brown hair and were aged between 12 and 15-years-old.

‘One suspect was described as being of Aboriginal appearance,’ they said.

‘One suspect was wearing denim jeans and a light grey coloured jumper, while another was wearing light blue shorts and a white hoodie.

‘The third suspect was wearing black leggings and a black hoodie.’

Avari Geschmay, 19, believed she was attacked by the same group of girls when she was leaving Seaford train station on Tuesday evening.

Avari Geschmay, 19, believed she was attacked by the same group of girls when she was leaving Seaford train station on Tuesday evening

Ms Geschmay alleges she was followed by the gang of three and punched in the back of her head by one of the girls.

‘They were following behind me, towards the car, kicking my bag, which had all my electronics,’ she said.

‘But once I got in the car, one of the girls started punching me in the back of my head.

‘I won’t be able to use the train station by myself anymore because anything could happen to me.

‘You don’t think that it’s going to be younger people that would do stuff like that.’

A spokesperson confirmed police were investigating an alleged assault at Seaford train station at about 7pm on Tuesday evening.

Police will investigate if the two incidents were linked.

Anyone with any information has been urged to contact Crime Stoppers.

Jake (left) and Callum Robinson (right) have not been heard from for days after going missing on a surfing trip to Mexico (pictured with their parents)