If North Korea fires missiles toward Guam, they would take about 14 minutes to reach the island, said Guam Homeland Security spokeswoman Jenna Gaminde.
She said residents would be immediately notified by the 15 All-Hazards Alert Warning System sirens, located in low-lying areas throughout the island.
North Korea announced Thursday that the nation has a detailed plan for a missile strike near Guam using four intermediate-range ballistic rockets. 
“Our office will be notified from the military and will utilize all forms of mass communication to get the message out to the public,” Gaminde said. Local media, village mayors and social media would be used to disseminate information, she said.
“If you hear the sirens, tune into local media — radio, print, television — for further instructions,” Gaminde said.
Four rockets 
North Korea said under the plan, four Hwasong-12 rockets would fly over Shimane, Hiroshima and Koichi prefectures in Japan, hitting waters 19 to 25 miles from the island, …
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