Workers also carried red banners emblazoned with slogans praising their leaders and the country's strength as President Trump continued to tout military action "if Kim Jong-un utters one overt threat against the US".
"In the interests of sanity and safety for the whole world, global pressure for dialogue and diplomacy must be overwhelming", he added.
North Korea has possessed nuclear weapons for years.
The award-winning This World programme discovered that North Korea is behind Glocom, which is "hiding in plain sight" by selling weapons to Africa, the Middle East and South East Asia.
He added: "We can not play fast and loose with nuclear weapons and nuclear threats because do you know what - a nuclear explosion doesn't stop at national borders, it doesn't stop at the vicinity where the bomb drops". "Our government must not drag our country into any military action over the Korea crisis, including joint exercises". "There can be no question of blind loyalty to the erratic and belligerent Trump administration".More news: CIA director: 'No intelligence' to suggest United States on cusp of nuclear war
More news: Duterte: Asean, Pyongyang would be a 'good dialogue partner'
More news: North Korea: No imminent threat of nuclear war, says Central Intelligence Agency chief
On Tuesday, Trump said North Korea "will be met with fire and fury like the world has never seen" if it continues to threaten the United States, after North Korea warned it will teach the USA a "severe lesson" with its nuclear weapons if Washington would dare to opt for military action against Pyongyang.
Pyongyang responded by saying it is "carefully examining" a plan to strike the US Pacific territory of Guam with missiles, claiming preparations for the strike could be ready in days.
It appears President Trump is willing to take that risk.
The BBC discovered that Kim Jong Nam had been secretly planning to become a European citizen and defect to the West.
Rep. Keith Ellison, the vice chair of the Democratic National Committee, told activists at the progressive Netroots Nation conference that President Trump was acting less responsibly than North Korean leader Kim Jong Un and that antiwar activism needs to ramp up as the president's rhetoric has.
Should it? Guam is American soil.