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A police vehicle is parked in the middle of the street next to damaged houses after a tornado tore through parts of the city of Koshigaya, Saitama prefecture on September 2, 2013. Several dozen people were injured when a tornado ripped through parts of eastern Japan on September 2, tearing off roofs and uprooting buildings. KAZUHIRO NOGI/AFP/Getty Images ( 522484092 )

A downed electricity pole blocks a street after crashing onto a house after a tornado tore though Koshigaya in Saitama prefecture, suburban Tokyo on September 2, 2013. Several dozen people were injured when a tornado ripped through parts of eastern Japan, tearing off roofs and uprooting buildings. YOSHIKAZU TSUNO/AFP/Getty Images ( 522483544 )

Damaged houses are seen after a tornado in Koshigaya city, Saitama Prefecture, north of Tokyo, Monday, Sept. 2, 2013. According to local reports, some 20 were injured by the tornado. (AP Photo/Kyodo News) ( Japan Tornado )

A funnel cloud is pictured from the city of Kasukabe over the city of Koshigaya in Saitama prefecture, north of Tokyo on September 2, 2013. Several dozen people were injured when a tornado ripped through parts of Koshigaya, tearing off roofs and uprooting buildings. AFP PHOTO / AYAME TAJIMA / JIJI PRESS ( 522483871 )

Pedestrians walk next to badly damaged houses after a tornado tore through parts of the city of Koshigaya, Saitama prefecture on September 2, 2013. Several dozen people were injured when a tornado ripped through parts of eastern Japan on September 2, tearing off roofs and uprooting buildings. KAZUHIRO NOGI/AFP/Getty Images ( 522484022 )

A man looks at a collapsed utility pole from a broken window after a tornado tore though Koshigaya in Saitama prefecture, suburban Tokyo on September 2, 2013. Several dozen people were injured when a tornado ripped through parts of eastern Japan, tearing off roofs and uprooting buildings. YOSHIKAZU TSUNO/AFP/Getty Images ( 522483714 )

Utility poles fall over a road after a tornado in Koshigaya city, Saitama Prefecture, north of Tokyo, Monday, Sept. 2, 2013. Tornadoes tore through eastern Japan on Monday, leaving dozens of people injured, at least one seriously, and destroying some buildings. (AP Photo/Kyodo News) ( APTOPIX Japan Tornadoes )

People step over scattered debris after a tornado tore though Koshigaya in Saitama prefecture, suburban Tokyo on September 2, 2013. Several dozen people were injured when a tornado ripped through parts of eastern Japan, tearing off roofs and uprooting buildings. YOSHIKAZU TSUNO/AFP/Getty Images ( 522483600 )

People gather next to damaged houses after a tornado tore through parts of the city of Koshigaya, Saitama prefecture on September 2, 2013. Several dozen people were injured when a tornado ripped through parts of eastern Japan on September 2, tearing off roofs and uprooting buildings. KAZUHIRO NOGI/AFP/Getty Images ( 522484286 )

Downed electricity poles and wires cover a street next to damaged houses after a tornado tore though Koshigaya in Saitama prefecture, suburban Tokyo on September 2, 2013. Several dozen people were injured when a tornado ripped through parts of eastern Japan, tearing off roofs and uprooting buildings. YOSHIKAZU TSUNO/AFP/Getty Images ( 522483540 )

Local residents look at downed electricity poles and damaged homes after a tornado tore though Koshigaya in Saitama prefecture, suburban Tokyo on September 2, 2013. Several dozen people were injured when a tornado ripped through parts of eastern Japan, tearing off roofs and uprooting buildings. YOSHIKAZU TSUNO/AFP/Getty Images ( 522483556 )

Local residents clean debris as a broken utility pole lies across a street after a tornado tore though Koshigaya in Saitama prefecture, suburban Tokyo on September 2, 2013. Several dozen people were injured when a tornado ripped through parts of eastern Japan, tearing off roofs and uprooting buildings. YOSHIKAZU TSUNO/AFP/Getty Images ( 522483570 )

A damaged electricity pole leans over a house after a tornado tore though Koshigaya in Saitama prefecture, suburban Tokyo on September 2, 2013. Several dozen people were injured when a tornado ripped through parts of eastern Japan, tearing off roofs and uprooting buildings. YOSHIKAZU TSUNO/AFP/Getty Images ( 522483580 )

A utility pole hits a house after a tornado in Koshigaya city, Saitama Prefecture, north of Tokyo, Monday, Sept. 2, 2013. According to local reports, some 20 were injured by the tornado. (AP Photo/Kyodo News) ( Japan Tornado )

Residents look at their street covered with scattered debris after a tornado tore through parts of the city of Koshigaya, Saitama prefecture on September 2, 2013. Several dozen people were injured when a tornado ripped through parts of eastern Japan on September 2, tearing off roofs and uprooting buildings. KAZUHIRO NOGI/AFP/Getty Images ( 522484127 )

Workers repair the roof of damaged house after a tornado tore through parts of the city of Koshigaya, Saitama prefecture on September 2, 2013. Several dozen people were injured when a tornado ripped through parts of eastern Japan on September 2, tearing off roofs and uprooting buildings. KAZUHIRO NOGI/AFP/Getty Images ( 522484291 )

A man stands in a damaged house after a tornado tore through parts of the city of Koshigaya, Saitama prefecture on September 2, 2013. Several dozen people were injured when a tornado ripped through parts of eastern Japan on September 2, tearing off roofs and uprooting buildings. KAZUHIRO NOGI/AFP/Getty Images ( 522484296 )

A man tries to fix a street sign next to a downed utility pole along a street after a tornado tore though Koshigaya in Saitama prefecture, suburban Tokyo on September 2, 2013. Several dozen people were injured when a tornado ripped through parts of eastern Japan, tearing off roofs and uprooting buildings. YOSHIKAZU TSUNO/AFP/Getty Images ( 522483733 )