Authorities yesterday focused on western Montana and southwest Canada in the search for an escaped convict from Arizona and his suspected accomplice who fashion themselves a present-day Bonnie and Clyde.

U.S. marshals said there have been reports that the accomplice, Casslyn Welch, was spotted Sunday at a restaurant in St. Mary, Mont., near Glacier National Park, which abuts the Canadian border.

Montana’s acting marshal, Rod Ostermiller, said there were multiple other tips from the Glacier area, but he didn’t say whether any included sightings of escapee John McCluskey.

A U.S. Border Patrol helicopter joined the search yesterday, but authorities on both sides of the rambling border acknowledged it was impossible to completely secure it.