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

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.

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