GUANGZHOU, May 6 -- Only one person was involved in a knife attack at a railway station in the southern Chinese metropolis of Guangzhou on Tuesday morning, local police said.

The male suspect carrying a long knife was shot by police and is being treated in hospital, the Guangzhou municipal public security bureau said in a statement.

The suspect was not carrying any identity card and his identity is yet to be confirmed. Six people were injured in the attack in Guangzhou railway station square at about 11:30 a.m.

Four of the injured, two men and two women, are receiving treatment at the General Hospital of Guangzhou Military Area Command of the People's Liberation Army. Their injuries are not life-threatening.

The attack did not affect railway operations, according to Guangzhou Railway (Group) Corporation.

The incident is the latest of three recent attacks at crowded train stations in the past three months.

Three people were killed and 79 injured in an attack at a railway station in Urumqi, capital of northwest China's Xinjiang Uygur Autonomous Region, on April 30 and on March 1, knife-wielding assailants killed 29 civilians and injured another 143 at a railway station in the southwestern city of Kunming.