One person has been killed and seven others injured in a series of stabbings in the city of Birmingham early on Sunday.
"We can now confirm that we have launched a murder investigation following last night's events," West Midlands Police said.
"A man has died and another man and a woman have suffered serious injuries. Five others have also been injured."
Britain's Foreign Secretary Dominic Raab said he had no information to indicate the incidents were terrorism-related but the public should stay "very vigilant".
West Midlands Police were called to reports of a stabbing in Birmingham city centre at approximately 12:30 am (local time) on Sunday.
"A number of other stabbings were reported in the area shortly after," they said in a statement.
Police cordons were in place on Sunday morning in three separate locations in the city centre: Hurst Street, Irving Street and Edmund Street.
West Midlands Mayor Andy Street said the series of incidents in the Hurst Street area of the city centre appeared to be related but the motivation for them was not yet understood.
"At this early stage it would not be appropriate to speculate on the causes of the incident," the police said.
President Donald Trump said on Friday the US was getting very close to meeting its objectives as it considers winding down its military efforts in the Iran war and called on countries that use the Strait of Hormuz to guard and police it "as necessary".
Iran is ready to let Japanese-related vessels pass through the Strait of Hormuz, a vital artery for global oil supplies, Kyodo news has reported, citing Iranian Foreign Minister Abbas Araqchi.
The Israeli military said early on Saturday it was striking Hezbollah targets in Beirut, after issuing an evacuation warning for seven neighbourhoods in the southern suburbs of the Lebanese capital.
The US military is deploying thousands of Marines to the Middle East, officials told Reuters on Friday, as President Donald Trump accused NATO allies of cowardice over their reluctance to send forces to help open the Strait of Hormuz.
A fire that broke out around lunchtime on Friday at a car parts factory in the South Korean city of Daejeon on Friday, has left 10 people dead, 25 seriously injured and 34 with minor injuries, the country's safety ministry said on Saturday.
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