A man has been stabbed and at least 10 others injured by a lone attacker in Coventry town centre.
A 33-year-old man has been arrested, while a man in his 20s is in a stable condition in hospital after the attack in Bedworth, Warwickshire Police said.
The other victims suffered minor injuries and are assisting officers with the investigation.
The force said it believes the suspect, from Bedworth, walked along Coventry Road and Gilbert Close, where he assaulted at least 10 people just before 8am.
Detective Sergeant Rich Simpkins described it as a "nasty incident" and appealed for anyone else injured to come forward.
He said: "This was a nasty incident which has left a number of people with injuries and I know this will cause the community great concern.
"The public can expect to see a heightened police presence in and around Bedworth town centre to provide reassurance while our officers continue to conduct their enquiries.