A news alert saying: "It appears North Korea launched a missile... 'Evacuate inside buildings or underground': government" was published by the NHK website and app at 6:55 pm local time.
But after just five minutes, NHK admitted the alert was sent in error.
"We're very sorry," NHK said on its website, without explaining further.
It comes just days after a false cellphone alert warning of an incoming ballistic missile terrified residents in Hawaii.
"Don't scare me. It's good that (North Korea) didn't launch a missile," one Japanese Twitter user said.
"I was surprised but it was a mistake. Do your work, NHK!" urged another.
The mistake also comes less than two weeks after a fake earthquake alarm in Tokyo, where millions of residents received an alert warning them that a strong quake was about to hit the Japanese capital.
In Hawaii, the notification was sent out on Saturday, lighting up phones with a disturbing alert urging people to "seek immediate shelter."
But it took nearly 40 minutes for a corrected message to be issued -- with Hawaii's governor saying there was no automatic way to cancel the false alarm, meaning it had to be done manually.
Disclaimer: No Business Standard Journalist was involved in creation of this content
