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NAMIE, Japan — Beyond radiation risks, an unexpected nuisance looms for residents returning to towns vacated after the Fukushima nuclear crisis — wild boars.

Hundreds of the animals, which have been known to attack people when enraged, descended from surrounding hills and forests into towns left deserted after the 2011 disaster.

A wild boar roams a residential area in an evacuation zone near Japan's tsunami-crippled Fukushima Daiichi nuclear power plant on March 1. TORU HANAI / Reuters

Now they roam the empty streets and overgrown backyards of Japan's deserted seaside town of Namie, foraging for food.

"It is not really clear now which is the master of the town, people or wild boars," Mayor Tamotsu Baba said. "If we don't get rid of them and turn this into a human-led town, the situation will get even wilder and uninhabitable."

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At the end of March, Japan is set to lift evacuation orders for parts of Namie, located just 2.5 miles from the wrecked nuclear plant, as well as three other towns.

Residents fled to escape radiation spewed by the Fukushima Daiichi plant, whose reactors went into meltdown after it was struck by an earthquake and tsunami on March 11, 2011.

In the nearby town of Tomioka, hunter Shoichiro Sakamoto leads a team of 13 assigned to catch and kill the wild boars with air rifles. Twice a week, they set about 30 cage traps, using rice flour as bait.

A member of Tomioka Town's animal control hunters group approaches trapped wild boars on March 2. TORU HANAI / Reuters

"After people left, they began coming down from the mountains and now they are not going back," he said. "They found a place that was comfortable. There was plenty of food and no one to come after them."

Since last April, the squad has captured about 300 of the animals, and intends to keep up its work even after the evacuation orders are scrapped, Sakamoto added.

More than half of Namie's former 21,500 residents have decided not to return, however, a government survey showed last year, citing concerns over radiation and the safety of the nuclear plant, which is being decommissioned.

But at town meetings earlier this year to prepare for the homecoming, residents had voiced worries about the animals.

"I'm sure officials at all levels are giving some thought to this," said Hidezo Sato, a former seed merchant in Namie. "Something must be done."

A caged wild boar TORU HANAI / Reuters

In December, a government panel said the estimated cost of cleaning up the Fukushima plant has doubled to nearly 22 trillion yen ($190 billion), and is expected to continue to grow.

The decommissioning work is expected to take decades.

Last month, a remote-controlled cleaning robot sent into a damaged reactor at the nuclear plant had to be removed before it completed its work because of camera problems most likely caused by high radiation levels.