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The RCMP is telling Canadians not to comply with threatening emails demanding Bitcoin after a wave of bomb threats were received across Canada and the U.S.

The RCMP said in a statement Thursday evening that it is aware of threats sent via email in which the sender threatens to detonate a bomb if the cryptocurrency ransom is not paid.

“If you have been the recipient of one of these email threats, do not respond to the Bitcoin demand,” the police force said on Twitter.

“Exercise caution, remain alert and immediately contact your local police.”

Threats were reported in many cities across Canada, including Ottawa, Montreal, Edmonton, Calgary, Penticton, Vernon, Toronto, Kamloops and Winnipeg. Several other police services have warned members of the public not to provide payments.

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The RCMP has not commented on whether it considers the threats to be credible.

In Toronto, police reported that there was a threat at King subway station, and it had been evacuated. The station has since been cleared.

WATCH: A series of bomb threats were sent to a large number of people and organizations around the U.S. and Canada on Thursday.

1:30 Bomb threats demanding Bitcoin investigated across Canada, U.S. Bomb threats demanding Bitcoin investigated across Canada, U.S.

Calgary Police said that based on the information available, they have determined threats received by city residents are a hoax.

The RCMP is aware of email threats made today across Canada, in which an individual threatens to detonate a bomb if ransom is not paid in the form of Bitcoin. — RCMP (@rcmpgrcpolice) December 14, 2018

If you have been the recipient of one of these e-mail threats, do not respond to the Bitcoin demand. Exercise caution, remain alert and immediately contact your local police. — RCMP (@rcmpgrcpolice) December 14, 2018

After a careful review of all the information available to us & liaising with other police agencies across North America we have determined the bomb threats received in #YYC today are a hoax. We continue to investigate but are confident there is no threat to public safety. — Calgary Police (@CalgaryPolice) December 13, 2018

In Penticton, Vernon and Kamloops, RCMP said bomb threats were sent to car dealerships. Police said they believe the threats are unsubstantiated.

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READ MORE: Calgary police say no reason to believe bomb threats credible

In Ottawa, an official with the Parliamentary Protective Service told Global News they are constantly monitoring “threats domestically and abroad,” but could not comment on specifics when asked whether any threats have been received.

WATCH: Toronto Police say they’re looking into multiple bomb threats

4:12 Toronto Police say they’re looking into multiple bomb threats Toronto Police say they’re looking into multiple bomb threats

“Parliamentary Protective Service continuously monitors threats domestically and abroad, and we adjust our security posture on Parliament Hill and within the Parliamentary Precinct accordingly,” a statement read.

READ MORE: Montreal police investigating bomb threats, demands for bitcoin payment

Threats in the U.S.

South of the border, many law enforcement agencies dismissed the threats, saying they were meant to cause disruption and compel recipients into sending money and were not considered credible.

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Some of the emails had the subject line: “Think Twice.” They were sent from a spoofed email address. The sender claimed to have had an associate plant a small bomb in the recipient’s building and that the only way to stop him from setting it off was by making an online payment of $20,000 in Bitcoin.

“We are currently monitoring multiple bomb threats that have been sent electronically to various locations throughout the city,” the New York City Police Department’s counterterrorism unit tweeted. “These threats are also being reported to other locations nationwide & are NOT considered credible at this time.”

WATCH: Charlotte, N.C., one of several North American cities to receive bomb threats

1:22 Charlotte, N.C., one of several North American cities to receive bomb threats Charlotte, N.C., one of several North American cities to receive bomb threats

At this time, it appears that these threats are meant to cause disruption and/or obtain money. We’ll respond to each call regarding these emails to conduct a search but we wanted to share this information so the credibility of these threats can be assessed as likely NOT CREDIBLE. — NYPD NEWS (@NYPDnews) December 13, 2018

WATCH: TV station in Maryland evacuated after bomb threats

1:09 TV station in Maryland evacuated after bomb threats TV station in Maryland evacuated after bomb threats

The FBI said it is assisting law enforcement agencies that are dealing with the threats.

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“As always, we encourage the public to remain vigilant and to promptly report suspicious activities which could represent a threat to public safety,” the FBI said in a statement.

FBI statement on recent bomb threats made across the country: pic.twitter.com/lOXnwtBZqB — FBI (@FBI) December 13, 2018

WATCH: Police in San Francisco investigating series of bomb threats

1:52 Police in San Francisco investigating series of bomb threats Police in San Francisco investigating series of bomb threats

The threats targeted areas in San Francisco, Penn State University, the University of Washington, among several local businesses. Some schools closed early and others were evacuated or placed on lockdown.

The bomb threats also prompted evacuations at city hall in Aurora, Illinois, the offices of the News & Observer in Raleigh, North Carolina and a suburban Atlanta courthouse.

— With files from Reuters and the Associated Press