People fearing exposure to radiation, were tested in Koriyama on Wednesday. Meanwhile, Tokyo residents worried about radiation fallout, are desperately trying to leave the city.

Koriyama is the largest city in Fukushima Prefecture, just some 48 kilometers away from the nuclear power plant.

A fire department official said that one person who had been exposed to radiation was decontaminated by using water.

Visitors to the Koriyama facility, including anxious parents with children, expressed relief at no radiation having been detected, though some said they remained anxious about the possibility of radiation spreading further.

Saori Endo, Employee from Iwaki City, said, "I was so nervous until I got the result. It was fine and now I feel relieved. If there had not been a nuclear accident I would not need to get tested or have had such a frightening experience, I'm angry."

Tokyo's Haneda airport was crowded with families on Wednesday as worried residents left the Japanese capital amid a nuclear crisis.

Long queues formed at check-in counters and flights were fully booked as parents with small children left the capital. The city is oddly quiet amid the nuclear threat while shortages caused by power cuts and a looming fuel shortage compound problems.

Eiichi Inaka, Construction Company Employee, said, "The nuclear situation is the most troubling. My children are small and they have their life ahead of them and I don't want them to become contaminated by nuclear fallout. The Fukushima nuclear plant is really worrisome."

Another fire broke out at the earthquake-crippled power plant in Fukushima, which has sent low levels of radiation drifting towards Tokyo over the past 24 hours, triggering fear in the capital and international alarm.