Four people were hurt — three critically — in a shooting at a Los Angeles Metro station.

It’s not clear if the shooting took place on the C Line train or at the Rosa Parks Metro Station in LA’s Willowbrook section, officials told KTLA-5. Cops were examining video from the platform and train to learn more about the Friday night incident, according to the LA Times.

Bullets flew after an argument between a trio in their late teens or early twenties, and three older men, witness Andrew Maynard told LA’s ABC-7.

“Then all of a sudden one of the young guys pulled out a gun and just started shooting into these guys, and the one guy took off running towards me and they shot him in the leg,” Maynard said.

Maynard said the bullet flew right by him.

One person who might have been involved in the shooting was taken into custody, police told the local ABC affiliate.

Cops responding to the shooting were involved in a crash that left eight people injured, ABC-7 also reported. Two officers, two children and four adults all had injuries described as non-life-threatening, the station reported.