People in Japan turned on their TV sets Tuesday morning to news dominated by J-Alert warnings issued by the government after North Korea launched a ballistic missile over the country for the first time since 2017.

The country's J-Alert warning system was activated at around 7:30 a.m. on Tuesday for Hokkaido, Aomori Prefecture and Tokyo’s Izu and Ogasawara islands.

Under the J-Alert system, developed by the Fire and Disaster Management Agency in 2007, messages are sent in times of national emergencies such as earthquakes, terrorist attacks and certain missile launches.