Baltimore investigators have broken up what they’re calling a regular “payday” gambling game in a city building after workers were caught drinking champagne and playing dice on the job.

A tip alerted the city’s inspector general, who sent agents to the Department of Transportation building Friday afternoon. Police were called and 13 workers were arrested. The suspects are described as relatively low-level employees in an events unit.

Baltimore Police spokesman Anthony Guglielmi says the crime wasn’t violent but is egregious because it’s a violation of the public trust.

One suspect, 68-year-old Michael Flowers, is charged with assaulting an investigator. Investigators seized about $6,300. The gambling charge is considered a misdemeanor.

A transportation department spokeswoman says the workers won’t report for duty Monday. She declined to say whether they are suspended.