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The shocking incident happened in Demesne Road in the Whalley Range area of the city this afternoon.

Footage has emerged showing the knifeman lunging at other cops who taser him before he is arrested.

At least one officer was taken to hospital but was later discharged.

One bystander told the Manchester Evening News they saw two police officers "bleeding quite heavily" after the attack.

(Image: MEN)

(Image: MEN)

Another said he launched the frenzied attacked after threatening people walking along the street.

He said: “I came out of the shop and I could hear shouting. The coppers just Tasered the guy. I could see two of the coppers were bleeding quite heavily. One had blood on his face. I could see the machete on the ground. The man was on the floor crying and shouting.

“These two coppers took the guy on even though he had a machete. It was pretty brave of them to engage with him. This was a Sunday afternoon. People were out with their kids.”

(Image: MEN)

Resident Haroon Altaf, 34, said: “I saw a man running across the road with what seemed to me to be a 3ft sword. Police were everywhere.

"He had run into somebody’s front garden and these police officers dragged him out but he’s gone for the officers. They were hitting him but you can see from the video is still attacking them when he’s on the floor.

“I think the officers did quite well. They were very professional. It’s a shame they got hurt in the process. What they did was good.

“One of the ladies passing by was quite shaken up. She couldn’t believe it had just happened."

Greater Manchester Police tweeted: “A 23-year-old man has been arrested after a police officer was slashed with a sword in Whalley Range.

“The incident happened about 1.50pm today on Demesne Road.

“The officer is currently in hospital with serious injuries.

“A number of roads remain closed.”

One witness wrote on Twitter: "Mum just phoned to tell me Upper Chorlton Road is blocked off. Absolute scenes round there, apparently."

Another person commented there was a "roadblock" in place after the attack.