People were gathered in the entrance to a nightclub in Amarillo when a vehicle pulled up at about 2:05 a.m. on Jan. 26 and a gunman exited the vehicle, opening fire into a large crowd with a rifle, the Amarillo Police Department said in a statement.

The Amarillo Police Department announced it would hold a press conference Monday morning in the wake of the Sunday mass shooting that killed one person and injured eight others at a South Polk Street nightclub.

Police said the shooter exited the vehicle and opened fire into a crowd with a rifle before fleeing the scene.

Amarillo Police say one man is dead, and nine others were injured in a shooting at a nightclub early Sunday morning. Investigators say the shooter, 23-year-old Robert Kenney Knox, of Amarillo, and the driver,

Two people suspected of being involved in the shooting early Sunday morning were arrested and charged with murder, according to police.

"The motive here is inexcusable. ... Ugly, impulsive violence and something that we should not accept as a community," Chief Birkenfeld said.