The killing of a US visitor in Beijing, which police believe was committed by a man with schizophrenia, has raised fears over the handling of suspects with mental health problems.

The man An Libo was arrested shortly after an attack downtown on Wednesday in which Howard Thomas Mills, 62, was stabbed to death.

According to The Cincinnati Enquirer, Mills was from Indian Hill, Ohio. On July 3 he arrived in Beijing on a business trip with his wife, a senior technologist at Procter and Gamble.