The balloons also contained two-thousand one-dollar USA bills, one-thousand DVDs and 500 booklets denouncing North Korea's nuclear and missile threats and the third-generation dynastic power succession.
China's state broadcaster CCTV announced on Friday that Air China-the only foreign carrier operating commercial flights into North Korea-would suspend services to Pyongyang from next week. Amid rising regional tensions, Pyongyang residents have.
Kim Dong-yub, a North Korea expert at Seoul's Institute for Far Eastern Studies, said the canisters and trucks suggested that the North was developing technology to "cold launch" ICBMs, ejecting them from the canisters before they ignite.
With the men wearing pins adorned with photos of Kim Il Sung, and the women in brightly coloured traditional dress, crowds lined up to bow to portraits of their state founder before touring an exhibition of photos and North Korean paintings.
Missiles appeared to be the main theme of a giant military parade, with Kim's grandson, leader Kim Jong Un, taking time to greet the commander of the Strategic Forces, the branch that oversees the missile arsenal.
The North has owned up to one such facility, at its Nyongbyon nuclear complex, but the USA government assumes it has more.
North Korea has begun a vast military parade to celebrate the birth of its founding father, Kim Il-sung, and warned that it was prepared to take the "toughest" action unless the United States ended its "military hysteria", The Guardian reports.
He said Kim Jong-un's nuclear program helped the regime's "long-term viability".
This year's celebrations come at a tense time on the Korean Peninsula, days after a USA strike group was deployed to the region and amid expectations of another missile or nuclear test by Pyongyang.
A White House foreign policy adviser says the type of missile that North Korea tried to fire on Sunday was medium-range, and that it exploded 4-5 seconds after it was launched.
"We will respond to an all-out war with an all-out war and a nuclear war with our style of nuclear attack", Choe Ryong Hae, a top North Korean officer, said.
Goose-stepping soldiers and marching bands filled the square, followed by tanks, multiple-launch rocket systems and other weapons.
A North Korean missile exploded during launch Sunday from the country's east coast, USA and South Korean officials said, a high-profile failure that comes as a powerful US aircraft carrier approaches the Korean Peninsula in a show of force.
On display for the first time were what appeared to be the Pukkuksong submarine-launched ballistic missiles (SLBMs), which have a range of more than 1,000 km.
Tension had escalated sharply in the region amid concerns that the reclusive North may soon conduct a sixth nuclear test or a ballistic missile test launch timed with the April 15 anniversary it calls the "Day of the Sun". Also on display was a powerful midrange missile, which outside analysts call "Musudan", and which can potentially reach USA air bases in Guam.
In his annual New Year's address, Kim said that North Korea's preparations for an ICBM launch have "reached the final stage". The country under his watch has been aggressively pursuing a goal of putting a nuclear warhead on an ICBM capable of reaching the continental United States.
South Korea has a patchy record of tracking developments in North Korea, as information about the secretive, authoritarian state is often impossible to confirm.