A man has been arrested on suspicion of murder after one person died and seven others were injured in stabbings across Birmingham city centre.
The 27-year-old suspect was arrested at an address in the Selly Oak area of the city at about 04:00 BST, West Midlands Police said.
Officers said he was also being held over seven counts of attempted murder.
The attacks happened at four Birmingham locations over a period of 90 minutes in the early hours of Sunday.
Forensic officers have been seen conducting searches at an end-of-terrace house in a cul-de-sac in Selly Oak, where neighbours said a police raid took place in the early hours.
Resident John Astley said he was woken by a loud bang during the night and saw a police van parked outside the neighbouring property.
He said: “I think there were three people living there. They have only been there a few months, since July or something like that.
“I had a look out of the front bedroom window and I just noticed there was a police van. I could hear a lot of noise coming from next door and it sounded like they were doing a search.”
Officers were first called out just after 00:30 on Sunday at Constitution Hill, where a man sustained a superficial injury.
About 20 minutes later they were called to Livery Street, near Snow Hill railway station, where a 19-year-old man was critically injured and a woman was also hurt.
At 01:50, police were sent to Irving Street, where a 23-year-old man suffered fatal injuries and another man was seriously hurt.
Ten minutes later, they were called to Hurst Street, in the city’s Gay Village, where a 32-year-old woman was critically injured and two men were less badly hurt.
Police say they are treating the attacks as “random” at this stage.
Supt Steve Graham said: “Officers worked through yesterday and into the early hours of this morning in a bid to trace the man we believe responsible for these terrible crimes.
“We issued CCTV footage of the suspect and had a strong response from the public. I’d like to thank everyone who shared our appeal and who provided information to the investigation.
“Clearly this is a crucial development but our investigation continues.”
A hotline number and website have been set up for members of the public to provide information, while the streets where the attacks took place remained closed on Monday morning as investigations continued.
Julia Robinson, the manager of Birmingham Southside Business Improvement District, described the “chaos” she saw as events unfolded on Sunday.