Please note the video in the player above is from a previous report from the Tuesday bomb threats.
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The Aurora Police Department said three libraries in the western suburb were evacuated as a precaution due to threats posted online, in an incident similar to reported threats at Chicago-area libraries earlier this week.
Thursday's set of threats also included a report of an active shooter at one of the libraries, but they have all since been determined to be false, police said.
Aurora police later issued a notice giving an all clear to the three public library locations.
Police continue to investigate the threats from both days, police said.
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On Tuesday, police were also called to libraries in Aurora, Evanston, Addison and Schaumburg. Those libraries were also evacuated as a precaution.
Another threat was called into the Harold Washington Library in Chicago Thursday. Police swept the building, and it was not evacuated.
Authorities did not say whether the threats are connected.