STURGIS, S.D. (AP) — Federal authorities are investigating the cause of a fire that destroyed a popular South Dakota biker bar this week.

A team from the Bureau of Alcohol, Tobacco, Firearms and Explosives on Thursday started investigating the scene at the Full Throttle Saloon in Sturgis. The ATF says the loss of the bar complex is estimated at $10 million.

At least two dozen agents are on the scene at the request of the state Fire Marshal's office.

Special Agent in Charge James Modzelewski says authorities including state and local officials will determine the cause of the fire.

Saloon owner Michael Ballard said in a statement on the bar's Facebook page that walking the grounds after the fire is "simply devastating."

The ATF is the federal agency with jurisdiction over fires and arson.

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