Apology letter found after US citizens killed in Mexico

A letter claiming to be from the Mexican drug cartel blamed for abducting four Americans and killing two of them condemned the violence and said the gang turned over to authorities its own members who were responsible.

In a letter obtained by The Associated Press through a Tamaulipas state law enforcement source, 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.

Drug cartels have been...