BBC: Meltdown alert at Japan reactor

A satellite photo of the Fukushima Daiichi plant showed the damage done to reactors 1 and 3, where there was an explosion on Monday

Technicians are battling to stabilise a third reactor at a quake-stricken Japanese nuclear plant, which has been rocked by a second blast in three days.

Sea water is being pumped into reactor 2 at the Fukushima Daiichi plant, after its fuel rods were fully exposed twice.

International nuclear watchdogs said there was no sign of a meltdown, although a cabinet minister said it was "highly likely" to be happening.

The crisis was sparked by Friday's 9.0-magnitude quake and tsunami.

Thousands of people are believed to have died, and millions are spending a fourth night without water, food, electricity or gas. More than 500,000 people have been left homeless.

(More here. For live coverage from the BBC, go here.)