Four people have been injured after a number of stabbings at the Arndale Centre in Manchester city centre.
The shopping centre has been evacuated and trams have stopped operating at Exchange Square outside the main entrance.
North West Ambulance Service said it had treated four people after being called at 11:17 BST. Police said there had been no fatalities.
A man in his 40s has been arrested on suspicion of serious assault.
Social media posts have shown a large number of officers at the scene and the suspect being Tasered.
An image sent to the Manchester Evening News appears to show a patient being treated by a Starbucks cafe in the centre.
Several people have posted on Twitter to say they had been evacuated.
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