Police say a man phoned in the threat, alleging that there were bombs in the Manitowoc County Sheriff's Office

By Char Adams
Updated February 04, 2016 09:55 AM
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STEVEN AVERY
Steven Avery
| Credit: Morry Gash/AP

Wisconsin police say a man who called in a bomb threat to a county sheriff’s office apparently referenced “getting justice” for Steven Avery – the subject of Making a Murderer, the Netflix docuseries, PEOPLE confirms.

A male caller phoned in the threat to the Manitowoc County Sheriff’s Office headquarters at about 6:40 p.m. on Wednesday, warning a dispatcher that there were “bombs in the building,” referring to the Manitowoc County Sheriff’s Office, according to a statement from the Manitowoc Police Department obtained by PEOPLE.

“The caller went on to say that there was a vehicle located in the parking lot that was also ‘packed with explosives,’ ” police said in the statement.

Police say the caller referenced “getting justice for Steven,” referring to Avery. Avery is currently serving life in prison for the murder of Teresa Halbach, a crime he has steadfastly denied committing.

Manitowoc police immediately set up a perimeter around the area and worked with Two Rivers police and a K-9 unit to clear the area, police say.

No devices were found, and the area was deemed safe and clear by 9 p.m.

However, police say a second, “very similar” was made about 20 minutes later.

Authorities say they found no “suspicious activity or items” as a result of the second call.

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“Manitowoc police investigators are currently working with members of the Wisconsin Department of Criminal Investigation to work the call backwards to determine the origin of the call and the identity of the caller,” police said in the statement.

Making a Murderer examines the twist-filled case of Avery, a Wisconsin man who was released from prison after being exonerated for rape only to be arrested again and convicted of Halbach’s murder.