EDMONTON, Alberta - Police say they are searching for a security company employee who has been charged with murder in an attempted robbery of an armored truck at a western Canada university that left three armed guards dead and one in critical condition.

Police say 21-year-old G4S Cash Services employee Travis Baumgartner is wanted for three counts of first degree murder as well as attempted murder. Canadian authorities say they have notified U.S border officials as well.

advertisement | advertise on newsday

The armored truck, abandoned but running, was found not far from the security company's offices.

The University of Alberta was quickly put on lockdown, but that was later lifted.

G4S Cash Services spokeswoman Robin Steinberg confirms that two male employees and a female employee were among the dead.