G.I.'s Open Attack to Take Falluja From Iraq Rebels
Explosions and heavy gunfire thunder across Falluja as American troops seize control of two strategic bridges, hospital and other objectives in first stage of long-expected invasion of city, center of Iraqi insurgency; Prime Min Ayad Allawi proclaims state of emergency for 60 days, which gives him broad powers to impose curfews, order house-to-house searches and detain suspects; force is composed of between 10,000 and 15,000 American soldiers and marines backed by newly trained Iraqi forces; American commanders brace troops for brutal block-by-block battle to take control and capture, kill or disperse estimated 3,000 to 4,000 insurgents; most civilians in Falluja, city of about 250,000, are believed to have left; Defense Sec Donald Rumsfeld and Gen Richard Myers are monitoring combat preparation and updated combat reports; photos; maps (M)
