International Desk : Four people were killed and five others injured after a man armed with a knife went on a rampage in the US state of Illinois.

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A man, 22, has been arrested and is being questioned by police. Police said the motive for the attacks remained unclear.

Police say that the home invasion occurred on Florence Street but the attacks unfolded at multiple locations.

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Winnebago Country Sheriff Gary Caruana said a young woman had sustained stab wounds to her hands and face after being seen running away from the suspect.

Another man, described by Sheriff Caruana as a "good Samaritan", sustained less serious stab wounds after trying to intervene to help the woman.

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Rockford Police Chief Carla Redd said that not all of the victims had been stabbed, but added that none had suffered gunshot wounds.

She said police did not believe there were any other suspects at large.

Rockford resident Ruth Gallagher said CBS her long-time postman was among the dead, while the US Postal Service confirmed that a postman had been killed.

Sun News/MR

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