Tokyo Electric Power Co. said the use of remote controlled machinery is believed to have caused an oxygen cylinder to explode near reactor 4 at the Fukushima Daiichi nuclear energy facility. The explosion occurred outside of the building that houses reactors at the facility and did not change conditions at the site, the company said.
Workers reported the explosion at 2:30 p.m. Tuesday local time in Japan. TEPCO said workers were using unmanned heavy machinery to remove debris at the site when the machinery damaged the cylinder, causing it to burst. There were no changes in radiation levels within the plant site and no injuries were reported.