"NO missile threat to Hawaii", the state's Emergency Management Agency tweeted at 8:20 local time (1:20 ET).
The emergency alert that some cell phone users received read: "BALLISTIC MISSILE THREAT INBOUND TO HAWAII".
Brian Schatz says a false alarm about a missile threat was based on "human error" and was "totally inexcusable".
There is no yet word on where the alert originated from. But officials soon confirmed that it was a false alarm.
The alert sent people scrambling for shelters and their cars, and online for additional news.
Emergency alerts sent Saturday to Hawaiians warning of a "ballistic missile threat" were reportedly false, officials said.
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The messages appear to have been sent on Apple's emergency message system.
Hawaii EMA sent a correction notification at 1:45 ET, 38 minutes after sending out its initial message.
A Buzzfeed reporter noted another alert clarifying that the first was a mistake wasn't sent out to cell phones for almost 40 minutes. "Repeat. False alarm", the message said.
"It was part of a drill that was going on", they said.
"There is no missile threat", the Democratic senator tweeted. We're trying to figure out where this came from or how this started.
The incident occurred amid high tensions internationally over North Korea's development of a ballistic nuclear weapon.