BOGOTÁ — More than 80 people have been killed in the country’s northeast region following failed attempts to hold peace talks with the National Liberation Army, a Colombian official said. Twenty others have been injured, according to William Villamizar, governor of North Santander, where many of the killings occurred. Among the victims are community leader Carmelo Guerrero and seven people who sought to sign a peace deal, according to a report that a government ombudsman agency released late Saturday. Officials said the attacks occurred in several towns located in the Catatumbo region near the border with Venezuela, with at least