A caller who made a bomb threat to the Wisconsin sheriff's office at the center of the popular Netflix series “Making a Murderer” mentioned "getting justice for Steven."

The Manitowoc Police Department confirmed that the county’s dispatch center received a bomb threat around 6:40 p.m.

"There are bombs inside the sheriff's office already and that there was a vehicle with explosive devices in it, in the parking lot,” the caller said, according to police.

The caller also discussed "getting Justice for Steven” during the conversation, according to police.

Bomb sniffing K-9 units went over the office and the parking lot and all locations have been cleared, the department said.

No devices have been found, police said. The investigation into the calls is ongoing.

The Netflix documentary "Making a Murderer" is set in Manitowoc County. It tells the story of Steven Avery, a man who stayed in prison for 18 years for a rape he didn't commit, but was later convicted of murdering 25-year-old photographer Teresa Halbach.

The series suggests the possibility that Manitowoc County sheriff's deputies planted evidence in the case.