Stymied by treacherous terrain and untamed wilderness, authorities are struggling to find an Army veteran suspected of killing four people at a Montana bar. But the difficult landscape isn’t the only challenge.

( NewsNation) — Montana Gov. Greg Gianforte and Attorney General Austin Knudsen will hold a news conference Tuesday as a search for the suspect in a deadly bar shooting moves into its sixth day. Michael Paul Brown, 45, a U.S. Army veteran, is accused of killing four people at the Owl Bar in Anaconda, Montana, on Friday.

On Monday, the U.S. Marshal Service posted on X that a reward of up to $10,000 would be offered for any information leading to Brown. The agency has also set up a tipline at: 1-8-77-WANTED-2.