In Japan, technicians are battling to stabilise a third reactor at a quake-stricken nuclear plant, which has been rocked by a second blast in three days. The Fukushima Daiichi plant's operators have resumed pumping seawater into reactor 2 after a cooling system broke. They warned of a possible meltdown when the fuel rods became exposed after the pump stopped as its fuel ran out. A cooling system breakdown preceded explosions at the plant's reactor 3 today and reactor 1 on Saturday. The today's hydrogen blast injured 11 people, one of them seriously, and sent a huge column of smoke billowing into the air. The fuel rod exposure at Fukushima Daiichi number 2 reactor is potentially the most serious event so far at the plant. However, engineers appear to have restored some water flow into the reactor vessel and if they are successful, temperatures will begin to fall again rapidly. Tens of thousands of people have been evacuated from the area around the plant. The US said it had moved one of its aircraft carriers from the area after detecting low-level radiation 160km offshore.Meanwhile, the relief operation is continuing after Friday's magnitude 8.9 quake, which triggered a tsunami that devastated swathes of the north-eastern coast of the country. The death toll remains unclear. Officials in Miyagi estimate 10,000 people died in that prefecture alone. Japanese media are reporting that two thousand bodies have been found on the shores of Miyagi prefecture. Tens of thousands of relief workers, soldiers and police have been deployed to the disaster zone. The capital, Tokyo, is still experiencing regular aftershocks, amid warnings that another powerful earthquake is likely to strike very soon.