A man who stabbed three people at a Manchester shopping centre has been arrested on suspicion of terrorism, Greater Manchester Police said.
Police were called to the Arndale Centre at 11.15am to reports of a stabbing, and three people were taken to hospital.
The suspect, a 40-year-old man, has been detained under the UK's Mental Health Act.
Greater Manchester Police said the man has been assessed by specialist doctors.
Witnesses described a scene of terror as shoppers, some with injuries, sought refuge in stores.
Officers from Counter Terrorism Police North West were called in to investigate, and at around 3.15pm, Greater Manchester Police Assistant Chief Constable Russ Jackson said the suspect had been arrested on suspicion of the commission, preparation and instigation of an act of terrorism.
He added that investigators did not believe anyone else to be involved in the attack.
He was first arrested on suspicion of a serious assault, the force said.
Greater Manchester Police initially stated five people had been injured, but later amended the figure to four.
A 19-year-old woman and another woman for whom no age was given were both taken to hospital with stab injuries and their condition was described as stable by the force.
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A man in his 50s was also hospitalised with stab wounds, while a woman in her 40s was treated by paramedics at the scene but was not stabbed.
North West Ambulance Service (NWAS) said one patient had suffered "serious" injuries.
NWAS tweeted: "We have treated four patients, including one patient with serious injuries, and all have been taken to hospital."
One shop worker, who gave his name only as Jordan, said: "A man was running around with a knife lunging at multiple people, one of which came into my store visibly shaken with a small graze.
"Soon after, security staff told all retail staff to close their doors and move the public to the back of the stores."
Jordan, who has only been working at the centre for a few months, said the attack took place on the ground floor.
