The US Treasury on Monday said it’s sanctioning “Los Chapitos,” the faction of the Mexican Sinaloa Cartel controlled by the sons of jailed cartel leader Joaquín “El Chapo” Guzman that Washington says facilitates illicit fentanyl production and trafficking into the country.

The United States on Monday imposed sanctions on the two fugitive sons of incarcerated Mexican Sinaloa Cartel leader Joaquin “El Chapo” Guzman and announced a reward offer of up to $10 million each for information leading to the arrest or conviction of the men.