Pictures on Sina Weibo, the Chinese equivalent of Twitter, show local police patrolling the station. Bodies in blood can be spotted on the ground in the pictures. Doctors were seen transporting injured people to a local hospital.
A Weibo user screen-named "HuangY3xin-Dione," who was dining in a restaurant near the railway station, said that she was "scared to death," adding that she saw a group of men in black with two long knives chasing people.
According to Kunming railway bureau, train departures have not been affected.
The incident has fueled massive anger among the people across China, with netizens severely condemning the violent attacks on social websites like Sina Weibo and WeChat, a popular instant messaging service.
The attacks at the station might have created blood and violence, but it has also awakened a strong sense of justice and strength among us. We strongly condemn violence, and we call on people to stop circulating bloody pictures, read a message on WeChat.
On Sina Weibo, netizens are spreading the word of stopping the circulation of bloody photos on the Internet.
"Stop publishing bloody photos, because that's just what the thugs want," a Weibo user with the screenname "Fuzhaolouzhu" wrote on her Weibo account.
Another Weibo user screennamed "CakeryCupcakes" said she hopes mainstream media could provide immediate and transparent report.
The security management bureau under the Ministry of Public Security called the incident a "severe violent crime" at its official Sina Weibo account.
Now, the situation is gradually going stable, and the injured have been treated, while police are investigating the case, it said.
"No matter what motives the murderers hold, the killing of innocent people is against kindness and justice. The police will crack down the crimes in accordance with the law without any tolerance. May the dead rest in peace," it read.
Zhang Yumin, 59, a retired cashier from Beijing, is flying to Kunming on Sunday morning with her husband for a sight-seeing tour. She said she will not change her schedule despite the attacks.
The Kunming Railway Station, located in the downtown area of the city, is one of the largest railway stations in southwest China. It was put into operation in 1958.
The latest violent terrorist attack that caused most civilian deaths happened in June last year in Lukqun Township of Turpan Prefecture in farwest China's Xinjiang Uygur Autonomous Region.
A total of 24 people were killed and 23 others were injured in the attack.
On October 28 last year, a jeep crashed at downtown Beijing's Tian'anmen Square, causing five deaths and 40 injuries. Police found gasoline, two knives and steel sticks as well as a flag with extremist religious content in the jeep.
The police later identified the deadly crash as a violent terrorist attack.