A 19-year-old man has been arrested on suspicion of attempted murder after a man was stabbed on a train in south London, British Transport Police have said.
A search had been under way after the victim was left with life-threatening injuries after the attack between Beckenham Junction and Shortlands railway stations on Wednesday.
BTP said they received reports of two men fighting while entering a train at Shortlands railway station in Bromley shortly before 4pm.
The victim, who is in his 20s, was in a critical but stable condition and his family were being supported by specialist officers, they added. A knife has been recovered.
Footage shared on social media showed a man wearing a black hooded jacket, black trousers and a face mask holding a large blade, and onlookers could be heard telling him to stop.
Supt Darren Malpas said: “We understand the concerns of the public following this incident and our detectives have been working tirelessly to investigate. I hope this arrest will bring some reassurance to those on the rail network.
“High-visibility patrols will continue in the area and across the network as a visible reassurance to the travelling public. Any witnesses who are yet to get in touch are urged to do so by calling 0800 405040 or texting 61016 quoting reference 397 of 27 March.”
Train services in the area were disrupted until about 6.30pm as police dealt with the incident.
A spokesperson for the rail company Southeastern said: “We are aware of a serious incident onboard one of our services this afternoon. We are urgently assisting the British Transport Police and would urge anyone with any information to contact them immediately.
“All of our trains are fitted with CCTV and we will be providing this footage to the British Transport Police to assist with their enquiries. We also have an integrated safeguarding team, comprised of Southeastern, BTP and Network Rail colleagues and we are already working together to find those responsible.”