While 911 service is working in Nova Scotia, customers are asked to use landlines to make calls to the emergency line.
"There is a service outage now affecting some regions in the Atlantic provinces".
Providers such as Telus and Bell have been fielding online complaints from users reporting a lack of service, saying they are "looking into" the issues.
"HRP and HRFE networks are impacted", said HRP Const. Dianne Penfound and city spokesman Brendan Elliott in a release Friday.
Marc Choma, the director of communications for Bell, said teams of technicians from the company are working to re-establish service "as soon as possible".
"We're aware of an issue impacting our services and are now investigating to restore", Bell posted on Twitter around 12 p.m. AT.
"Emergency response agencies and critical infrastructure owners/operators have contingency plans for telecommunications outages and these plans are now being put into place".
It offers no information about what may have caused the cut cable, or where the cable is located.More news: Substance sickens at least 10 people at Kansas City IRS site
In Cape Breton Regional Municipality, emergency services, including 911 and the non-emergency police landline 902-563-5151 were operational.
Update 08/04/17 12:30: Article updated with additional statement from Bell regarding 911 calls.
The outage, reportedly caused by damage to a cable, was affecting cell phone networks, the internet and television services, and telephone landlines, the operators said. Atlantic time. Bell brought services back online by rerouting traffic through other networks. "If 911 does not work, we advise residents to contact the appropriate agencies on their non-emergency line", said New Brunswick Justice and Public Safety Department Director of Communications Elaine Bell.
Emergency Health Services in Nova Scotia said it is "experiencing a province-wide communications outage", and has told all on-duty crews to return to their stations in a tweet.
The New Brunswick Emergency Measures Organization tweeted that it is aware of the outages.
The office also suggested people with an emergency go to the nearest fire station for help.
"The message we put out to people was check on their neighbours", said Errington.
But "recent reports mostly originate from: Halifax, Toronto, Dartmouth, St. John's, Moncton, Fredericton, Saint John, Ottawa, Mississauga, and Sydney", the website states.