A CAR BOMB STRUCK A CONVOY IN RAMADI ON SUNDAY, WOUNDING FOUR AMERICAN TROOPS, THE MILITARY SAID, ACCORDING TO AP. THE EXPLOSION OCCURRED NEAR THE CONVOY AS IT WAS HEADED TO THE GOVERNMENT CENTER IN THE INSURGENT-RIDDEN CITY, 115 KILOMETERS (70 MILES) WEST OF BAGHDAD. FOUR COALITION FORCES WERE WOUNDED, THE MILITARY SAID IN A STATEMENT. U.S. AND IRAQI FORCES HAVE RECENTLY STEPPED UP THEIR PRESENCE IN THE CITY, WHERE MANY AREAS ARE SO DANGEROUS THAT THEY GO UNPATROLLED.