Witnesses said a row broke out between two men and one of them plunged a knife into the other man's side before fleeing through Watsons Walk next to Argos at around 9am.

Passers-by found a chair and tended to the injured man while the emergency services were alerted and rushed to the scene on Market Place.

Police threw a cordon around the scene as a crowd gathered.

One market trader, who did not want to be named, said: "There were two black guys arguing and then one of them stabbed the other one in his side. Someone found a chair and sat the injured man down, there was a lot of blood.

"The other man ran off through the passageway next to Argos."

One shopper said: "I am shocked that something like this has happened in broad daylight. The streets are getting worse."

A South Yorkshire Police spokeswoman this morning confirmed there had been "an incident" but no further detail was forthcoming at the time of going to press.

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