U.S. troops attack Najaf, bomb Baath headquarters By Kieran Murray NEAR NAJAF, Iraq, April 2 (Reuters) - U.S. troops attacked Fedayeen fighters loyal to Iraqi President Saddam Hussein in the central city of Najaf on Wednesday, strafing militia positions and bombing the city's Baath Party headquarters. This correspondent saw A-10 Warthog ground attack planes fly low over the city and open fire on suspected Fedayeen fighters who have offered stiff resistance to the U.S.-led invasion. Lieutenant Colonel Chris Holden of 101st Airborne said the city was a centre of Fedayeen resistance. "The target is to destroy Fedayeen units and anyone...