ROME, March 4 -- U.S. troops fired on a vehicle carrying an Italian journalist to freedom after a month in captivity Friday, wounding her and at least one other person and killing an Italian intelligence agent who had helped to arrange her release. [...] In Baghdad, the U.S. military said in a statement that the car was fired upon shortly before 9 p.m. local time as it was "approaching a coalition checkpoint in western Baghdad at a high rate of speed." The statement said that "the people at the checkpoint attempted to warn the driver to stop by using hand...