GUANGZHOU, May 6 -- Six people injured in a knife attack at a railway station in the southern Chinese metropolis of Guangzhou on Tuesday morning are all out of danger, local police said late Tuesday night.

The male suspect was caught at the scene, but his identity is still unknown, police said.

Police saw people panic at Guangzhou's railway square at 11:22 a.m. Tuesday, and found a man carrying a knife at the center of the confusion.

Warning shots were fired and the man turned on the police who then shot him twice. The suspect is being treated in hospital and out of danger, the Guangzhou municipal public security bureau said in a statement.

An initial investigation found there was only one attacker who was not carrying an identity card. Four of the injured, two men and two women, are still receiving treatment at the General Hospital of Guangzhou Military Area Command of the People's Liberation Army.

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

The incident is the latest knife attack at a crowded train station 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.