A source claims that law enforcement doesn't believe the threat should to be taken seriously, and regards it as a fear tactic that may not even be affiliated with Daesh.
"While our standard practice is to decline comment on specific operational and investigative matters, the FBI routinely notifies individuals and organizations of information collected during the course of an investigation that may be perceived as potentially threatening in nature." the Federal Bureau of Investigation said in a statement.
Not all of the information on the list is current, according to the source, who was not authorized to discuss the investigation publicly.
The violent extremist organization, outlawed in many countries, including Russia and the United States, controls territories in Syria and Iraq, and has claimed responsibility for several acts of violence including the deadly November 2015 attacks in Paris, which killed 130 people,, and the October 2015 downing of a Russian Airbus A321 passenger aircraft over Egypt, killing all 224 people aboard.
US authorities have arrested over 70 individuals for attempting to support Daesh extremists since 2013.