A Near West Side man was held on $100,000 bail for reporting a false crime. View Full Caption Shutterstock

COOK COUNTY CRIMINAL COURTHOUSE — A Chicago Police SWAT team was called to the Willis Tower on Wednesday to investigate "a slaughter" on the 81st floor, prosecutors said.

But when the officers arrived, the entire floor was vacant, according to Assistant State's Attorney Erin Antonietti, who spoke during a brief bond hearing Thursday.

Decardo Duncan, 50, has been charged with filing a false report, a felony offense, after he allegedly called 911 about 1 p.m. Wednesday to report the "slaughter" at the famed tourist attraction, 233 N. Wacker Dr.

A Cook County judge on Thursday ordered Duncan held in lieu of $100,000 bail.

"In light of ... the recent security and threat alerts, I'm taking this case extremely seriously," Judge Peggy Chiampas said.

The 911 call came less than a week after a series of coordinated terror attacks killed at least 129 people in Paris.

A Willis Tower spokeswoman on Friday said it was company policy not to comment on police or legal matters.

According to an arrest report, Duncan made four additional "nuisance" calls to 911 over the past few days. Antonietti said she wasn't privy to the content of each additional call.

Police found Duncan, who lives on the Near West Side, by tracing his phone number. Duncan admitted to making the calls, authorities said, and the 911 call to Willis Tower was placed on a phone near Jackson Street and Ogden Avenue.

When asked about the incident, a Chicago Police spokeswoman on Thursday said in an email: "Officers responded to that location [Willis Tower] after a telephone threat was made. The incident was deemed to be not bonafide. No further information is available."

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