Police have named four people killed in a shooting at a bar in the US state of Montana as a manhunt for an army veteran suspected of the attack entered its third day.

Barmaid Nancy Lauretta Kelley, 64, and three customers - Daniel Edwin Baillie, 59, David Allen Leach, 70, and Tony Wayne Palm, 74 - died as a rifle-wielding assailant opened fire at the pub in the city of Anaconda on Friday morning.

Police said the suspect, 45-year-old Michael Paul Brown, fled to the nearby foothills afterwards.

Authorities have offered a reward of $7,500 (£5,650) for any information that will lead to his capture.

"This is an unstable individual who walked in and murdered four people in cold blood for no reason whatsoever," Montana Attorney General Austin Knudsen told a news conference on Sunday.