A wave of bomb threats were reported against businesses, schools, hospitals and other places across the country on Thursday, including sites in New York, Chicago, and Los Angeles. The threats are reportedly "not credible."

The FBI in a statement said they were "aware of the recent bomb threats made in cities around the country, and we remain in touch with our law enforcement partners to provide assistance. As always, we encourage the public to remain vigilant and to promptly report suspicious activities which could represent a threat to public safety."

Authorities in New York City were monitoring “multiple bomb threats that have been sent electronically to various locations throughout the city,” the New York Police Department’s counterterrorism bureau said on Twitter.

“These threats are also being reported to other locations nationwide & are NOT considered credible at this time,” the NYPD said.

There are reports that the perpetrators have requested a ransom in Bitcoin to call off the "bombings." Numerous sources say no ransoms have been paid and no bombs have been confirmed, NBC News reports.