GUATEMALA CITY—Guatemala's attorney general dispatched a special team Monday to investigate the slaying of a federal prosecutor and six other people in an attack near the Mexican border. Attorney General Claudia Paz y Paz said she was sending prosecutors and investigators to the area of northern Guatemala where Irma Yolanda Olivares, who worked in one of the prosecutor's regional officers, was slain along with an official working for a government social service agency and five others on Sunday night. President Otto Perez Molina blamed the attack on drug traffickers, who have taken over swathes of territory along the border with Mexico. The Interior Ministry said that a group of armed, masked men had intercepted the sport-utility vehicle carrying Olivares and three other passengers, who were returning from the inauguration of a hotel in the city of La Mesilla. The attackers opened fire, then burned the victims' bodies, officials said. Three other people were found fatally shot and burned in another vehicle nearby, official said. Officials were not immediately able to determine the identities of the three or whether they were killed by the same attackers, said Ricardo Guzman, sub-secretary general in the prosecutor's office. "The death of a member of the attorney general's team is a serious attack against the institution and against the work done by each prosecutor's office to fight impunity in this country," Paz said.