The governor said on CNN that "It was a mistake made during a standard procedure at the change over of a shift, and an employee pushed the wrong button."

In 2016 the FCC voted to expand Wireless Emergency Alerts, allowing for more detailed messages that can recommend action or link to more information about something like an AMBER Alert. Later this month, it will vote on changes that could allow for more precisely targeted local alerts. This incident will probably come up in the discussion.

Update: The Hawaii Emergency Management Agency broadcast a press conference about the incident live on Facebook and released a statement (PDF). The governor, along with the head of the EAM Vern Miyagi, laid out a timeline for what happened. During a test of the system around 8:07 AM local time, it appears that an employee needed to click a box in the interface to send the test message, but clicked the wrong area and sent out a real notification across TV, wireless and radio. The tests occur three times a day around shift changes and have been going on since November.

While they quickly realized there was a mistake, there was no template or system set up for sending out a cancellation message, leading to the 38-minute gap. For now, the EMA says it has suspended all drills until it completes a review, and has already implemented a two-person activation rule for both test and actual notifications. Also, a cancellation command that can be triggered within seconds of an error is now in place.