The United States and Japan have agreed to work out a road map to prevent nuclear terrorism ahead of the second nuclear security summit in 2012, according to a senior White House official visiting Tokyo.

The road map is intended to cover measures to block theft of nuclear materials by internal personnel and technological cooperation between the two countries over "security by design concepts" of nuclear-related facilities such as nuclear power plants and nuclear fuel-processing facilities.

Laura Holgate, senior director for weapons of mass destruction, terrorism and threat reduction at the White House's National Security Council, indicated that the United States and Japan are deepening their alliance in nuclear security for protecting nuclear materials and nuclear-related facilities — a field of great importance to the Obama administration.