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NORTHWEST HOUSTON — A murderer is on the run after gunning down an armored car driver outside of a northwest Houston bank.

It happened at the Wells Fargo bank,  right off of the Northwest Freeway and Hollister Road, during Monday’s evening rush.

Investigators say the Brinks guard was ambushed and fatally shot as he was refilling the drive-thru ATM. His partner, who was also the driver, was not hurt. At this time police have plenty of witnesses but no suspects.

Police have not released the identity of the security guard.