Three Brainerd United Parcel Service (UPS) delivery trucks were damaged by smoke and fire just before midnight Wednesday.

The Brainerd Fire Department was called at 11:43 p.m. Wednesday to the UPS Customer Center, 1009 Madison St., in the Brainerd Industrial Park. The initial call came in as the reporting party hearing an explosion and seeing fire and smoke coming out of the windows at UPS.

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Nineteen firefighters responded to the call and a firefighter stayed on scene until 10:30 a.m. Thursday to secure the scene.

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Brainerd Fire Chief Kevin Stunek could not comment on any of the details of the incident, but said the Minnesota state fire marshal, along with the FBI and the Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) are investigating.

The Crow Wing County Sheriff's Office bomb squad was called to the scene Thursday.

According to the ATF website, the ATF is a law enforcement agency in the United State Department of Justice that protects communities from violent criminals, criminal organizations, the illegal use and trafficking of firearms, the illegal use and storage of explosives, acts of arson and bombings, acts of terrorism, and the illegal diversion of alcohol and tobacco products. The ATF partners with communities, industries, law enforcement and public safety agencies to safeguard the public.

The FBI investigates terrorism, counterintelligence, cyber crimes, weapons of mass destruction, public corruption, civil rights, organized crime, violent crime and major thefts.

Calls were made to UPS, but not returned.

JENNIFER STOCKINGER may be reached at jennifer.stockinger@brainerddispatch.com or 855-5851. Follow on Twitter at www.twitter.com/jennewsgirl.