Day 6 - Wednesday, March 16
- A fire breaks out at the building housing the No. 4 reactor. It's believed to be the same spot where a fire broke out Tuesday.
- The roof of reactor No. 4 is believed to be cracked.
- Japan suspends operations at Fukushima after a surge in radiation makes it "too dangerous for workers to remain at the facility."
- After a brief suspension, workers are allowed back on site.
- Japan's emperor makes a rare national appearance, officials say it is his first ever TV appearance
- Nuclear Regulatory Commission Chairman Gregory Jaczko indicates in remarks to a House committee that the US believed the damage at the Fukushima Daiichi nuclear power complex was even graver than Japanese officials had outlined in public.
Day 7 - Thursday, March 17
- The US ambassador in Japan issues a statement to American citizens living within 50 miles of Fukushima to evacuate.
- Workers begin to try to use a water cannon to blast water into the No. 4 building.
- US authorizes voluntary departure from Japan of family members of diplomatic staff, and later US citizens.
- Three out of the six reactors at Fukushima are relatively stable, say officials.
- TEPCO said it has started work to connect outside power cables to the plant and that electricity could be connected soon.
- Japan nuclear agency says pool for cooling spent nuclear fuel at No. 4 building remains "serious concern."
- The national Meteorological Agency reports that the highest tsunami wave on March 11 was 15 meters high in Mekawa, Miyagi.
Day 8 - Friday, March 18
- Japan's nuclear agency upgrades the incident level at Fukushima up from level 4 previously on a 1-7 scale, joining France's Nuclear Safety Authority's assessment, citing reactors No. 2 and No. 3 reactor as the most problematic.
- At 2:46 local time, exactly one week after the earthquake struck, people across the nation observed a minute's silence.
- The IAEA reports that it has NOT received any notification from the Japanese authorities of citizens sickened by radiation contamination.