Counter-terrorism police are investigating after five people were stabbed at a shopping centre in central Manchester.
A man in his 40s has been arrested on suspicion of serious assault, Greater Manchester Police (GMP) have said.
North West Ambulance Service (NWAS) said one patient had suffered “serious” injuries, tweeting: “We have treated four patients, including one patient with serious injuries and all have been taken to hospital.”
In a statement, GMP said: “Specialist officers are continuing to respond to an incident at the Arndale shopping centre in Manchester city centre.
“We can confirm that five people have been stabbed and taken to hospital.
“In these early stages we are keeping an open mind about the motivation of this terrible incident and the circumstances as we know them.
“Given the location of the incident and its nature officers from Counter Terrorism Police North West are leading the investigation as we determine the circumstances.
Prime Minister Boris Johnson tweeted: “Shocked by the incident in Manchester and my thoughts are with the injured and all those affected. Thank you to our excellent emergency services who responded and who are now investigating what happened.”
North West Ambulance Service said they were called out at 11.17am to a stabbing incident.
A shop worker, who gave his name only as Jordan, 23, described a man “running around with a knife lunging at multiple people, one of which came into my store visibly shaken with a small graze.