Parts of a national forest near Anaconda, Montana, were closed late Saturday as authorities expanded their search for the gunman accused of killing four people at a bar on Friday morning.

Authorities urged residents to stay inside and on high alert because they consider Michael Paul Brown armed and dangerous.

Michael Paul Brown, the Army veteran suspected of killing four people in a bar shooting in Montana is still at large and is ‘believed to be armed and extremely dangerous,’ per authorities. Residents in the Anaconda area have been advised to stay inside on ‘high alert.