Hundreds of Tokyo residents huddled together into subway stations and an amusement park basement on Monday, as the Japanese capital held its first evacuation drill for a military attack since World War II.

The drill simulated a North Korea missile attack, amid ongoing tensions over the hermit state's nuclear weapons program.

Around 300 volunteers took part in the choreographed exercise, which was staged at the Tokyo Dome.

Read more: Japan public TV sends false North Korean missile alert

A loudspeaker in the park rang out a terrifying warning, urging people to seek shelter indoors or underground as the drill began.

"An advisory about a missile launch was just issued. Everyone, please stay calm and seek shelter in the basement," the announcement blared. "Those who are already indoors, please stay there." A security guard ran across the complex, shouting "A missile was launched!"

Meanwhile, park employees quickly ushered residents into reinforced concrete buildings and subway stations, shouting "a missile was launched, a missile was launched!"

Following the drill, Japanese government official Hiroyuku Suenaga told volunteers that "a missile from North Korea would arrive in less than 10 minutes and the first alert would come about three minutes after launch, which gives us only around five minutes to find shelter."

Read more: Japan eyes aircraft carriers to counter North Korea, China

Necessary precaution or bid to fan fear?

The drill received a mixed response. While some volunteers welcomed the idea, it also attracted a number of protestors who criticizes as part of the Japanese government's war games.

"I think it's better than nothing to have such a drill, but I am praying there is no missile attack from the North," said Shota Matsushima, a 20-year-old university student.

However, Mari Chihara, a 68-year-old protestor, accused the exercises of "fanning missile scare among the Japanese people and their animosity toward North Korea." Ikie Kamioka, 77, pointed that no amount of preparedness would help survive a nuclear attack. "You won't survive if a war occurs. A nuclear war would devastate everything," she said.

A new type of drill

Citizens in earthquake-prone Japan are familiar with drills simulating natural disasters. Such evacuations are even seen as seasonal rituals with schools, workplaces and care homes all taking part.

However, drills simulating a North Korean missile attack remain fairly novel. While around 20 similar drills were held in other parts of Japan last year, Monday marked the first simulated North Korean attack in Tokyo.

North Korea launched two ballistic missiles over northern Japan at least twice last year, and test-fired another missiles in loft-trajectory into Japanese waters.

The North Korean regime has singled out Japan for being a key US ally in the region, threatening to "sink" the country into the sea and to turn it into "ashes."

dm/rt (Reuters, AP, AFP)