FUKUSHIMA, Japan — Gray smoke rose from two reactor units Monday, temporarily stalling critical work to reconnect power lines and restore cooling systems to stabilize Japan’s radiation-leaking nuclear complex.

SOMA, Japan — A new fire broke out at a nuclear reactor early Wednesday, a day after the power plant emitted a burst of radiation that panicked an already edgy Japan and left the government struggling to contain a spiraling crisis caused by last week’s earthquake and tsunami.