Today, Los Alamos is a quaint tight-knit community with the best education system in the state.

President Barack Obama pays tribute to the "silent cry" of the 140,000 victims of the atomic bomb dropped 71 years ago on Hiroshima, and called on the world to abandon "the logic of fear" that encourages the stockpiling of nuclear weapons.

Barack Obama is to visit Hiroshima this month - the first serving US president to travel to the Japanese city since it was hit by a US nuclear bomb in 1945.

Just weeks before the US dropped the most powerful weapon mankind has ever known, Nagasaki was not even on a list of target cities for the atomic bomb.

The Japanese city of Nagasaki is marking 70 years since the dropping of an atomic bomb by the United States.

Residents in the Japanese city of Hiroshima commemorate the 70th anniversary of the first atomic bomb being dropped by a US aircraft.