A person was rushed to hospital after being seriously assaulted on a Glasgow train.
British Transport Police were alerted to the attack on board a train travelling between Glasgow Queen Street and Garrowhill stations shortly before noon on Friday.
Detectives say they are keen to speak to three teenage boys who were on the train at the time. They are described as white, 13–15 years old, all wearing black face coverings and jogging bottoms, while one is reported to have been wearing a black balaclava.
They are understood to have left the train at Bellgrove Station.
Officers are urging anyone with information to come forward.
A British Transport Police appeal issued on Friday said: "Detectives are urgently appealing for witnesses following a serious assault on-board a train between Glasgow Queen Street and Garrowhill stations today (15 October).
"The report was made at 11.47am and officers were deployed to the train. Paramedics also attended, and one person was taken to a local hospital where he remains.
"Officers are keen to speak to anyone who may have witnessed the incident or anyone with information to assist their enquiries.
"They are particularly keen to identify and speak to three boys who were on-board the service. They are described as white, 13–15 years old, all wearing black face coverings and jogging bottoms. One is reported to have been wearing a black balaclava.
"It is believed they departed the train at Bellgrove station.
"Witnesses or anyone with information can contact BTP by texting 61016 or by calling 0800 40 50 50 quoting reference 240 of 15/10/21."