NEW : Japanese rescue squad arrives in the Nuclear Regulatory Commission . China search and rescue teams are in hard-hit Ofunato . Ofunato sends search and rescue team as it recovers from its own earthquake . China sends team despite long-running tensions with New Zealand .
NEW : Mexican rescue squad arrives in Sendai . U.S. search and rescue teams are in hard-hit Ofunato . New Zealand sends search and rescue team as it recovers from its own earthquake . China sends team despite long-running tensions with Japan .