Hawaii's Emergency Management Agency (EMA) also confirmed on Twitter that there was no threat.
The erroneous alert sent recipients into a state of frenzy, with scores reportedly running for shelter and taking cover, until Democratic Rep. Tulsi Gabbard debunked the alert as a false alarm.
People across the USA state received a text alert this morning, spreading fear and panic for more than 20 minutes before the mistake was acknowledged. "It was a false alarm based on a human error".
THIS is the terrifying moment Tottenham's clash with Everton was interrupted on live TV in Hawaii by a missile heading towards the island. "This false alarm caused real harm across the state".
"While I am thankful this morning's alert was a false alarm, the public must have confidence in our emergency alert system", he wrote.
It was sent out just after 8am local time.
A spokesman for the command said it "detected no ballistic missile threat to Hawaii" and that the message warning had been sent in error.
Cindy McMillan, a spokeswoman for Gov. David Ige (IG'-eh) confirmed to The Associated Press that it was human error, but she didn't have further details.
White House spokesperson Lindsay Walters referred all questions about the alert to the Department of Defense. "There is nothing more important to Hawaii than professionalizing and fool-proofing this process".
Federal Communications Commission Chairman Ajit Pai also took to social media to announce the panel would launch an investigation.
"From a NORAD perspective and that of the U.S. Northern Command, we are still trying to verify what happened", he said of the false alert. "I thought 'No, this is not happening today, '" Malapit said, adding he was still "a little freaked out" and feeling paranoid even after hearing it was a false alarm. In November, Hawaii began testing warning sirens to prepare for a possible nuclear attack.
Hawaii is on the flight path between North Korea and the US.
North Korean President Kim Jong-un has threatened to unleash his country's growing missile weapon capability against USA states or the U.S. territory of Guam, prompting President Donald Trump to threaten tough actions against Pyongyang.