Railway officials have detained a man for stabbing two people to death and injuring another on the 2640 train from Kunming to Chengdu after a dispute over the man's alleged "loud humming", according to a Xinhua report.
The arrested man, who police said is surnamed Yan, allegedly got into an argument around 10:35 am on Saturday with three other male passengers, over Yan's loud humming while listening to his portable CD player.
The other passengers, surnamed Luo, Ren and Wu, dragged Yan down to the floor of their train car and began to beat him. Yan then pulled out a folding knife and retaliated, stabbing all three of his attackers.
Luo died onboard the train and Ren died afterward in a hospital. Wu is hospitalized in stable condition.
Employees aboard the train said they heard passengers scream that someone had been killed. By the time they had made it to the scene of the fight, it was allegedly already over.
Police are still investigating the case and have not said if Yan will be charged with any crimes.