(Keizer, OR)  --  Police are investigating the robbery of a Brink's armored-truck employee in Keizer.  Authorities say the employee was robbed at gunpoint while servicing an ATM at a former Roth's grocery store in the Schoolhouse Square shopping center.  A SWAT team responded to the scene and surrounded the premises, but the suspect wasn't found.  There's no word on what was stolen in the robbery.