Alerts advising Hawaiians to seek immediate shelter from an incoming ballistic missile were sent in error when someone "pushed the wrong button", officials say.

Shortly after 8am on Saturday (early Sunday morning NZ time), several alarmed Hawaii residents began posting screenshots of alerts they had received reading: "BALLISTIC MISSILE THREAT INBOUND TO HAWAII. SEEK IMMEDIATE SHELTER. THIS IS NOT A DRILL."

A corrected alert was sent out 38 minutes later. "There is no missile threat or danger to the State of Hawaii," it read. "Repeat. False Alarm."

State Governor David Ige apologised to Hawaiians, saying an employee had pressed the wrong button.

The US government announced there would be a full investigation.

An alert system is in place because of the potential proximity of Hawaii to North Korean missiles.

Source: Stuff.co