China knife attacker 'kills five'

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A man has stormed into a police station in the Chinese city of Shanghai and stabbed at least five officers to death, officials said.

The man was arrested after the attack in the Public Security Bureau office in the city's Zhabei district.

At least five injured people were being treated in hospital for stab wounds, Shanghai Daily said.

The motive for the attack was not immediately known but the man was said to be a 28-year-old from Beijing.

Television pictures showed some of the wounded being taken to hospital.

One eyewitness told TV reporters: "Some of them had stabs in the chest. Blood was all over some of their faces."

Police have cordoned off the building.