February 4, 2016 12:41 PM EST

An anonymous caller phoned in a bomb threat this week to the sheriff in the Wisconsin county where the documentary show Making a Murderer takes place, officials said Thursday.

The caller said bombs had been left in the Manitowoc County sheriff’s office, according to a CBS News report. In an apparent reference to Steven Avery, the male caller referenced “getting justice for Steven.” Making a Murderer has cast doubt on Avery’s conviction for a 2005 murder and suggested that Manitowoc County officials may have acted inappropriately in that case.

The call was deemed a hoax. Law enforcement officials are working to determine the origin of the call.

Write to Justin Worland at justin.worland@time.com.

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