An alert signalling an incident at a major nuclear power plant near Toronto was sent "in error" to millions of residents Sunday, causing a scare and prompting calls for an investigation.
The emergency alert went out shortly before 7:30 am (1230 GMT). Though intended for residents living within a 10-kilometer (six-mile) radius of the Pickering Nuclear Generating Station, it went to all Ontario residents.
About an hour later, the Ontario Power Generation company that manages the nuclear plant announced on Twitter that the alert was issued by mistake.
"There is NO active nuclear situation taking place at the Pickering Nuclear Generating Station," it said.
"The previous alert was issued in error. There is no danger to the public or environment."