Akhir 13, 1432 H/March 18, 2011, SPA -- Japan reached out Friday to the U.S. for help in reining in the crisis at its dangerously overheated nuclear complex, while the U.N. atomic energy chief called the disaster a race against the clock that demands global cooperation, as AP reported. At the stricken complex, military fire trucks began spraying the troubled reactor units again Friday morning, with tons of water arcing over the facility in desperate attempts to douse the units and prevent meltdowns that could spew dangerous levels of radiation. «The whole world, not just Japan, is depending on them,» Tokyo office worker Norie Igarashi, 44, said of the emergency teams at the plants.