A middle-aged mentally ill man injured two foreigners in downtown Shanghai on Sunday, raising concerns about the management of psychotic people in big cities.

The Chinese man, identified by police as Song, attacked the two foreigners with a fruit knife at 2:45 pm in the city's Hongkou district. He was wielding a small club in the other hand, police said.

Both victims are male and work in the city. Police said they suffered minor injuries and one of them left a hospital after receiving stitches.