MEXICO CITY, Feb 23 (Reuters) - A tip about drug lord Nemesio Oseguera's romantic liaisons led Mexican authorities to the cartel leader's hideout in a small town of Jalisco state where he was killed, Mexican authorities said on Monday in the first account of the ambush that spawned violence across much of Mexico. The U.S. provided intelligence to help pinpoint the exact location of the compound in the town of Tapalpa where Mexican authorities found the cartel boss, but Mexican officials underscored that they spearheaded the operation. Throughout Sunday, suspected cartel members set fire to vehicles and businesses, blocking roads and disrupting travel, in protest of Oseguera's killing. The cartel operative offered a 20,000 peso ($1,160) reward for the deaths of military personnel, according to Trevilla. Garcia added that authorities were closely monitoring for a reaction or restructuring within the cartel that could unleash further violence.