The man wanted in a deadly armored car heist at a university in western Canada that left three armed guards dead has been arrested by U.S. border officials in Washington state, police said Saturday.

Edmonton police Supt. Bob Hassel said in a news release that Travis Baumgartner was stopped near a border crossing in Lynden, Washington, southwest of Abbotsford, British Columbia. Officials said Baumgartner was in his pickup truck and was alone.

Police said a sum of money was found in the truck when Baumgartner was arrested. Police had earlier called it a "significant" sum.

Baumgartner, 21, had been on the run since Friday when four armed guards were gunned down, three of them fatally. He faces three counts of first-degree murder and one count of attempted murder.

Baumgartner was the fifth member of a G4S Cash Solutions crew that was re-loading bank machines at a University of Alberta mall and residence where the shooting happened, police said.