Authorities said there is no danger to the public at Ontario's Pickering Nuclear Generating Station after the alert was sent out to phones Sunday morning.
Ontario Power Generation later tweeted that the alert "was sent in error. There is no danger to the public or environment."
Important update: the alert regarding #Pickering Nuclear was sent in error. There is no danger to the public or environment.— Ontario Power Gen (@opg) January 12, 2020
This comes two years after Hawaii emergency officials mistakenly sent out an alert of a ballistic missile headed toward the state.
The false emergency alert apparently happened because "the wrong button was pushed," Hawaii House Speaker Scott Saiki said in a statement.
He added, "Apparently, the wrong button was pushed and it took over 30 minutes for a correction to be announced. Parents and children panicked during those 30 minutes."