Police in Dallas are on the hunt for a gunman who opened fire aboard a DART train Sunday, leaving one person dead and two others injured.

The shooting took place around 4:30 p.m. following an argument between two passengers traveling on a northbound Green Line train near Hatcher Station, according to a DART spokesperson speaking to CNN.

One of the people taking part in the dispute pulled a gun and fired.

Two shooting victims were taken to a hospital, where one of them later died. Police said another bystander was treated at the scene for a shrapnel injury.

The gunman fled the scene and was being sought. As of Monday morning, no arrests have been made.

The shooting disrupted normal train and bus shuttle operations for hours as police investigated the deadly incident.

It was not immediately known whether the people involved in the altercation knew each other, or what sparked the initial fight.

The train shooting took place just a day after a massacre at an outlet mall in the Dallas suburb of Allen that left eight people dead and seven others injured.  

On Saturday afternoon, 33-year-old Mauricio Garcia, an Army veteran, drove down to the Allen Premium Outlets and opened fire on shoppers with an AR-15-style rifle.

Garcia was later shot dead by a police officer who was responding to an unrelated incident in the area.

The feds are investigating whether the gunman, who wore a patch on his clothing with the acronym “RWDS,” which stands for “Right Wing Death Squad,” held white supremacist and neo-Nazi views.