http://www.bbc.co.uk/news/world-asia-pacific-12749444
Further confusion surrounds events in number four reactor building where a fire was reported in or around a pool used to store fuel rods that had been removed from the reactor. Reports from Japan indicate technicians are unable to pump water into the pool, and it may now be dry.
In the meantime, the key task for workers at the plant remains to get enough water into the reactors – and, now, into the spent fuel pools – with the poor resources at their disposal. …”
(Scrolling news banner says TEPCO is considering using a helicopter to drop water on the reactor buildings — and that there is a ban on aircraft flying in the 30-km radius to prevent aircraft picking up radioactive contamination.)