A 6.6 magnitude aftershock hit Japan on the one month anniversary of the tsunami and quake which devastated much of the country. So far there has been no additional damage and a tsunami warning was lifted. The BBC's Roland Buerk is in Japan, where has been covering the relief efforts. He says that the people have grown weary, but they are still stoic. "The awe with which the world has seen their response to their disaster has perhaps given them more strength," he says. However, it will take a long time to rebuild.