LONDON (Reuters) - A number of people were stabbed Friday at a shopping center in the northwestern city of Manchester, requiring treatment of at least four of them, police said.

British police arrested the suspect in the stabbing incident and evacuated the Arndale shopping center in Manchester immediately after the incident.

The Manchester appeal was referred to the counterterrorism police,

Witnesses said, according to British media, that the scene was terrifying after at least three were stabbed in a shop cafes.

The identity of the perpetrator and his motives were not immediately known. The city police evacuated the shoppers, while ambulance teams provided initial treatment to the victims.

Police arrested a 40-year-old man on suspicion of stabbing in Manchester, according to Sky News.

Last August, British police announced that one person had been killed in a stabbing attack in Camden, northwest of London.

Before that, the Islington area north of the British capital in May last stabbing incident in which two people were seriously injured.