Baghdad, Iraq, Aug 2, SPA -- A roadside bomb exploded at theentrance to a tunnel in central Baghdad on Tuesday targeting a U.S. military convoy, police said. It was not clear if there were casualties. The explosion occurred as the convoy was about to enterthe tunnel in Bab Shargi, near the central Tahrir Square,said police Capt. Abdul-Hussein Munsif. He said two Humveesappear to have been damaged. An Associated Press reporter near the scene said U.S. andIraqi have cordoned the area and the convoy was still inplace.--SPA1258 Local Time 0958 GMT www.spa.gov.sa/280564