TOKYO (Dow Jones)--A small unmanned vehicle used for reconnaissance lost control and crashed onto the roof of unit No. 2 at the Fukushima Daiichi nuclear power plant, operator Tokyo Electric Power Co. (9501.TO) said Friday. The company said that no fire or smoke was observed from the accident but that it was unknown if it had caused any damage to the roof of the reactor. The No. 2 unit is the only
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