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However, there has been no indication that any attack on the Pacific island by North Korea is imminent.
In a message to the public, Guam's Governor Eddie Baza Calvo said there was currently "no threat" to the US territory and the Marianas archipelago, but it was "prepared for any eventuality".
'Scary' situation - BBC's Yogita Limaye in Seoul, South Korea
On the streets of Seoul, barely 50km (30 miles) from the border with North Korea, the latest developments have drawn mixed reactions. Kim Seong-su, 62, said he thought Pyongyang was bluffing to preserve its regime and justify its nuclear programme.
But others are more concerned. Yeon Eui-sook says she finds the situation scary. "I hope everyone can live in peace. Kim Jong-un keeps doing this and making us worry," she said.
Analysts say the language from Pyongyang always gets more aggressive in August, when the US and South Korea conduct joint military exercises. But this time - with a US president who also uses strong words - the confrontation is getting even fiercer than usual.
Mr Trump meanwhile denied there were any mixed messages from his administration.
Earlier this week, US Secretary of State Rex Tillerson played down the rhetoric between the two sides.
But in an interview with the BBC on Thursday, White House Deputy Assistant Sebastian Gorka dismissed the top diplomat's comments.
"You should listen to the president," he said. "The idea that Secretary Tillerson is going to discuss military matters is simply nonsensical.
Mr Gorka recalled a quote from a Holocaust survivor he often refers to when lecturing on grand strategy, saying: "When a group of people repeatedly says they want to kill you, sooner or later you should take them seriously".
"North Korea has said they wish to annihilate the United States and use nuclear weapons. Sooner or later, somebody should take them seriously," he said.
The tiny but important island of Guam
The 541sq km (209 sq miles) volcanic and coral island in the Pacific between the Philippines and Hawaii.
It is a "non-incorporated" US territory, with a population of about 163,000.
That means people born in Guam are US citizens, have an elected governor and House Representative, but cannot vote for a president in US national elections.
US military bases cover about a quarter of the island. About 6,000 personnel are based there and there are plans to move in thousands more.