A Japanese funeral parlor worker shovels dirt onto coffins containing unidentified earthquake victims during a mass funeral on April 8, 2011 in Yamamoto, Miyagi Prefecture, Japan. The 9.0 magnitude strong earthquake struck offshore on March 11 at 2:46pm local time, triggering a tsunami wave of up to ten metres which engulfed large parts of north-eastern Japan, and also damaging the Fukushima nuclear plant and threatening a nuclear catastrophe. The death toll continues to rise with numbers of dead and missing exceeding 20,000 in a tragedy not seen since World War II in Japan. (Photo by Athit Perawongmetha/Getty Images)

YAMAMOTO, JAPAN - APRIL 08: Japan Self-Defense Force members pay their respect to unidentified earthquake victims in vehicles during a mess funeral on April 8, 2011 in Yamamoto, Miyagi Prefecture, Japan. (Photo by Athit Perawongmetha/Getty Images)

Workers operate backhoes on a burial site for unidentified earthquake victims on April 8, 2011 in Yamamoto, Miyagi Prefecture, Japan. (Photo by Athit Perawongmetha/Getty Images)

Japan Self-Defense Force members and funeral parlor workers carry the coffin of an unidentified earthquake victim during a mass funeral on April 8, 2011 in Yamamoto, Miyagi Prefecture, Japan. (Photo by Athit Perawongmetha/Getty Images)

A Buddhist monk chants for unidentified earthquake victims during a mass funeral on April 8, 2011 in Yamamoto, Miyagi Prefecture, Japan. (Photo by Athit Perawongmetha/Getty Images)

Relatives pay their respects at the site where coffins of earthquake victims were buried on April 8, 2011 in Yamamoto, Miyagi Prefecture, Japan. (Photo by Athit Perawongmetha/Getty Images)

Japanese policemen wearing a protective suits undergo testing for possible nuclear radiation at screening center about 35 kilometers away from Fukushima Nuclear Power Plant as they finish their duty inside exclusion zone on April 9, 2011 in Minamisoma, Fukushima Prefecture, Japan. (Photo by Athit Perawongmetha/Getty Images)

Earthquake victims line up for food at evacuation shelter on April 9, 2011 in Fukushima City, Fukushima Prefecture, Japan. (Photo by Athit Perawongmetha/Getty Images)

Earthquake victims line up for clothes at evacuation shelter on April 9, 2011 in Fukushima City, Fukushima Prefecture, Japan. (Photo by Athit Perawongmetha/Getty Images)

Earthquake victims line up for food at evacuation shelter on April 9, 2011 in Fukushima City, Fukushima Prefecture, Japan. (Photo by Athit Perawongmetha/Getty Images)

A Japanese policeman undergoes testing for possible nuclear radiation at screening center about 35 kilometers away from Fukushima Nuclear Power Plant on April 9, 2011 in Minamisoma, Fukushima Prefecture, Japan. (Photo by Athit Perawongmetha/Getty Images)

Earthquake victims line up for food at evacuation shelter on April 9, 2011 in Fukushima City, Fukushima Prefecture, Japan. (Photo by Athit Perawongmetha/Getty Images)