Guam has posted emergency guidelines to help residents prepare for any potential nuclear attack as North Korea threatens to fire missiles at the US Pacific territory.

Pyongyang’s state-run KCNA news agency said on Thursday its army would complete plans in mid-August to fire four intermediate-range missiles over Japan to land near Guam amid increasingly heated rhetoric over the North’s nuclear weapons program.

North Korea did not threaten Guam with a nuclear attack, but the crisis between Pyongyang and the US has stirred fears of nuclear conflict in the region.

It came as Donald Trump suggested nuclear threat could be great for tourism in Guam.

Guam’s governor said there was no heightened threat but the government has issued a preparedness fact sheet, which covers what to do before, during and after a nuclear attack.

“Do not look at the flash or fireball. It can blind you,” it said. “Take cover behind anything that might offer protection.”

If caught outside, it says to “remove your clothing to keep radioactive material from spreading”.

It suggests having an emergency plan and supply kit and a list of potential concrete structures near home, work and school to serve as fallout shelters.

The fact sheet advises people to not scrub or scratch the skin, use soap, shampoo and water but avoid hair conditioner because it binds radioactive material.

It also advises parents to stay where they are and wait for instructions, even if they are separated from their children.

Guam is home to about 163,000 people and a US military base.

US President Donald Trump warned on Friday that the US military was “locked and loaded, should North Korea act unwisely”.

Guam Governor Eddie Calvo said while he agreed with sending a clear message to North Korean leader Kim Jong Un, he didn’t “want the temperature to get any higher”.

The news comes as US President Donald Trump says a military option against North Korea was “locked and loaded”, his latest salvo in an escalating war of words with Pyongyang’s nuclear-armed regime.

“Military solutions are now fully in place, locked and loaded, should North Korea act unwisely. Hopefully Kim Jong Un will find another path,”Mr Trump tweeted.

The missive ratcheted up his already bellicose rhetoric over North Korea’s weapons program, as Beijing appealed to the two leaders to dampen their fiery exchange.

A day prior Mr Trump had hardened his warning that Pyongyang would face “fire and fury” if it kept threatening the US, saying maybe his tough talk “wasn’t tough enough”.

Mr Trump also warned North Korea it should be “very, very nervous” of the consequences if it even thinks of attacking US soil, after Pyongyang said it was readying plans to launch missiles towards the Pacific territory of Guam.

Pyongyang said the scheme to target the island, a key US military outpost in the western Pacific, was intended to “signal a crucial warning” as “only absolute force” would have an effect on a US leader “bereft of reason”.

Beijing on Friday pleaded with the US and North Korea for restraint, urging the two parties “to be cautious with their words and actions”.

China has repeatedly urged a resumption of long-dormant six-party talks to peacefully resolve the crisis, but its position has been overshadowed by the emerging brinkmanship between Mr Trump and Kim.