In Japan, rescuers have found a survivor of earthquake and tsunami, eight days after the disaster devastated coastal areas in the north. Japan's NHK broadcaster said the young man was found in the city of Kesennuma, in Miyagi prefecture – one of the hardest-hit regions. It said the survivor, aged in his 20s, was rescued from a wrecked house today and he is said to be in a stable condition but was in shock and unable to speak. The quake and the tsunami it triggered has killed at least 7,200 people. About 11,000 more remain missing. Meanwhile engineers are attempting to restart the cooling systems of reactors at the Fukushima Daiichi nuclear plant, which were crippled by the quake. They have been spraying water to cool overheating reactors and spent fuel rods, to curb the release of radiation. There are fears over four of the six reactors. A nuclear and industrial safety agency official said they are scheduled to restore electricity at number 1 and 2 reactors today. It said reactors number 5 and 6 also will be powered today and are scheduled to restore power to number 3 and 4 tomorrow. Yesterday, the government raised the alert level at the plant from four to five on a seven-point international scale of atomic incidents. Japanese nuclear officials said core damage to reactors 2 and 3 had prompted the move. The operator Tokyo Electric Power (Tepco) has said it was not ruling out the option of entombing the plant in concrete to prevent more radiation leaks – a similar method was used after the world's worst nuclear accident in Chernobyl in 1986.