Japan woke up to a terrifying text alert

Around 5:58 a.m. local time, North Korea fired a missile over Hokkaido, Japan, and shortly thereafter, the country's J-Alert warning system kicked in and delivered the chilling news to the smartphones of millions residents of Japan. 

One Twitter user based in Japan posted an image of the alert that came in, which read, "A missile was fired from North Korea. Please evacuate to a sturdy building or basement."