Authorities are investigating after a small plane crashed Wednesday in southern Wisconsin, the National Transportation Safety Board said.

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The NTSB said in a tweet that it is investigating the crash of a Mooney M20R aircraft near Watertown, a city in Dodge and Jefferson counties about 48 miles northwest of Milwaukee.

Wisconsin Fox News graphic

The National Transportation Safety Board is investigating the Wednesday crash of a Mooney M20R propeller plane in Watertown, Wisconsin. (Fox News)

Television helicopter footage from the scene showed apparent aircraft debris spread across a field and in an adjacent wooded area.

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Mary Bellows, who lives in Watertown, told the Milwaukee Journal Sentinel that around noon she heard the plane and then a big boom. She said her room shook, and then a large plume of smoke rose near her home.

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Local officials had not released any information about the crash by early afternoon. A message seeking comment and details on the crash was left by The Associated Press with the Watertown Police Department.