At 7:30 a.m., Sgt. Brent Nagel and Sgt. John Henderscheid were sitting in the sergeants' office of the West St. Paul (Minn.) Police Department when they heard a call dispatched to patrol units: an ambush alarm at the Retail Employees Credit Union at 1685 South Robert Street.
The sergeants looked at one another. Both were all too familiar with the usual alarm aggravations associated with the job—robbery alarms, burglary alarms, panic alarms, and the all-too-often common denominator, false alarms.








