TOKYO (Reuters) - A loud noise was heard outside a reactor building at Japan's quake-damaged Fukushima Daiichi nuclear plant as the operator of the plant cleared away rubble, Tokyo Electric Power Co (Tepco) said on Tuesday.
There was no change in radiation levels at the plant's monitoring posts and no one was injured, a Tokyo Electric official told reporters.
Some people at the plant suspect that a gas cylinder in the rubble may have been damaged and made the sound, the official said.
Tokyo Electric said it was gathering information on the cause of the sound and will give more details at a planned daily briefing from 4 a.m. EDT.
(Reporting by Yoko Nishikawa; Editing by Nathan Layne)