JST

Officials say it was similar to the earlier hydrogen explosion; The Guardian's Ian Sample has put together this Q&A to explain how that happened.5.15am 2.15pm JST: Tokyo Electric Power Company, which runs the Fukushima Dai-Ichi plant, says radiation levels at the unit are well below the legal limits following this morning's hydrogen explosion.

Japan tsunami and nuclear alert - live coverage 2011

Kyodo has just flashed up a statement that winds are preventing Self Defence Force helicopters from dousing it with water, citing an unnamed minister.5.24am 2.24pm JST: A colleague points out that Couchsurfing has set up a site for people displaced by the disasters.

Japan nuclear crisis - live updates 2011

• The No 4 reactor remains a source of major concern, with gaping holes in the reactor's outer building and another fire within the reactor was spotted at 5.45am JST that may have lasted half an hour.

Japan nuclear crisis - live updates 2011

Some analysts expected the bank to announce further emergency measures later in the day.6.02am (3pm JST): An update on the situation at Fukushima's second nuclear plant (ie not the one that experienced the blast this morning) from the UN nuclear watchdog, released at 4.15am GMT (1.15pm JST).

Japan tsunami and nuclear alert - live coverage 2011

There is no indication any of the personnel have experienced ill effects from the exposure, officials said.4.45am 1.45pm JST IEEE Spectrum has an interesting piece here on the role that rescue robots will play in operations.

Japan tsunami and nuclear alert - live coverage 2011

People are offering space in Hiroshima, Osaka, Yokohama and numerous other cities.5.21am 2.21pm JST: Seoul's Yonhap news agency is reporting that South Korea will send part of its reserve of boric acid - used to slow down fission reactions - to its neighbour.

Japan nuclear crisis - live updates 2011

Many survivors are still packed into emergency shelters in the disaster zone, where food and fuel supplies are said to be running low.5.57am 2.57pm JST: There's a lot of concern about the conditions survivors face.

Japan nuclear crisis - live updates 2011

Though companies are trying to send relief supplies, they cannot secure fuel for returning,'' Yonekura said, stressing that gasoline stations along expressways and supply roads are in need of swift supply of gasoline.5.46am 2.46pm JST: More from Fukushima: Reuters is reporting that authorities plan to bulldoze an emergency route to crippled reactor No.4 to allow access for fire trucks, although it appears this morning's blaze is now out.

Japan nuclear crisis - live updates 2011

Singaporean authorities have announced they will test imported Japanese produce for potential radiation "as a precautionary measure".4.52am 1.52pm JST: According to this piece in the New York Times, a US aircraft carrier, Ronald Reagan, passed through a radioactive cloud from the Japan nuclear reactors.

Japan tsunami and nuclear alert - live coverage 2011

When the deputy commissioner had called about this, Rhyme had pointed out that he might have a few problems with the JST—the NYPD job standard test portion of the requirements.

The Burning Wire Jeffery Deaver 2010