NEW : Obama says U.S. is monitoring Japanese power plant for possible leaks . So Air Force planes were able to deliver that . Japan : U.S. is monitoring coolant in case any nuclear reactors explode . American ships are headed to Japan to help in relief effort . No American casualties are reported ; State Department sets up alert , e - mail information .
NEW : Obama says U.S. is monitoring Japanese power plant for possible leaks . Japan : U.S. is monitoring coolant in case any nuclear reactors explode . American ships are headed to Japan to help in relief effort . No American casualties are reported ; State Department sets up alert , e - mail information .