around 10:00 jst on 16 march, nhk helicopters flying 30 km away videotaped white fumes rising from the fukushima i facility. officials suggested that the reactor 3 building was the most likely source, and said that its containment systems may have been breached. the control room for reactors 3 and 4 was evacuated at 10:45 jst but staff were cleared to return and resume water injection into the reactor at 11:30 jst.