Hawaii has brought back a Cold War-era attack warning system and is running monthly tests.

The attack warning signal will sound on the first workday of each month in conjunction with the state's regular tests of the outdoor warning siren and emergency alert system broadcast system typically used for natural disasters. The attack warning signal tests began on Dec. 1.

The test of the Attack Warning Signal "is in response to North Korea's test launches and threats to use an intercontinental ballistic missile against the United States," HTA president and CEO George D. Szigeti said in a statement. "It is imperative to remember that the threat of a missile attack against Hawaii by North Korea is a highly unlikely possibility, according to the Hawaii Emergency Management Agency."

Japan implemented a similar system earlier this year also in response to North Korea's missile tests. The last time the attack warning signal was tested in Hawaii was the mid-1990s, after the wind down of the Cold War. In the event of an actual attack on the Aloha State, people are instructed to seek shelter immediately after hearing the warning signal. The emergency alert system will also broadcast warnings on TV and radio.

"Leisure and business travelers planning a trip to Hawaii should not be alarmed by the testing of this new Attack Warning Signal," Szigeti said. "Its implementation is consistent with the state's longstanding policy to be prepared and informing the public well in advance of any potential threat to Hawaii's well-being."

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