Hawaii: North Korea’s latest missile capable of striking all of America has prompted the US state of Hawaii to test a nuclear attack warning siren for the first time since the end of the Cold War. At 11.45 am on Friday, one-minute warning sound followed by one-minute wailing siren signalling the attack blared across the state. A North Korean missile could reach Hawaii in 20 minutes after launch and it is “critically important” for tourists and locals to understand what each tone means, said Vern Miyagi, head of Hawaii Emergency Management Agency, to Honolulu Star Advertiser. The warning sound means people should immediately seek shelter. The test will be repeated on the first business day of every month. Hawaiians, who are used to hearing alerts for tsunamis and other natural disasters, did not seem to take notice of the test. Emergency officials are examining whether any of the sirens malfunctioned or were too soft.