Karachi, Pakistan, Sept 8, SPA -- Pakistani security officialscordoned off the U.S. Consulate in the volatile southerncity of Karachi on Wednesday after a bomb threat, but foundno explosive, officials said. Unidentified callers phoned a police help line and theconsulate, saying a bomb had been planted inside theconsulate and would detonate at 2.30 p.m. (0930 GMT), saidFayyaz Leghari, chief of operations for Karachi police. Police blocked access roads to the consulate and searchedthe surrounding area and found no bomb. They werecontinuing their search, but suspected it was a hoax, hesaid. "We have taken all precautionary measures. We cannot takeany risk," Leghari told The Associated Press. A spokesman at the U.S. Embassy in the capital Islamabadconfirmed the consulate received a bomb threat and that itwas working with authorities to determine its authenticity.--SPA1513 Local Time 1213 GMT www.spa.gov.sa/199385