CIUDAD VICTORIA, Mexico (AP) — 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 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.

“We have decided to turn over those who were directly involved and responsible in the events, who at all times acted under their own decision-making and lack of discipline,” the letter reads, adding that those individuals had gone against the cartel’s rules, which include “respecting the life and well-being of the innocent.”