Mark Stevenson/Associated Press

A letter claiming to be from the Mexican drug cartel blamed for abducting four Americans and killing two of them condemns the violence and says the gang turned its own members who were responsible over to authorities. In a letter obtained by The Associated Press through a Tamaulipas state law enforcement official, the Scorpions faction of the Gulf cartel apologized to the residents of Matamoros where the Americans were kidnapped, the Mexican woman who died in the cartel shootout and the four Americans and their families.