The police in Brazil have arrested the head of a Mexican drug cartel, which is a serious blow to one of the more powerful drug gangs challenging the Sinaloa Cartel for control of the Mexican drug trade. Brazilian federal prosecutors announced the arrest on Wednesday.

According to the arrest warrant, police detained Jose Gonzalez Valencia, 42, a leader of the Jalisco New Generation Cartel (CJNG), with the intention of fulfilling a U.S. extradition request.

Once a little-known gang, the CJNG has grown in recent years to challenge the Sinaloa Cartel of captured kingpin Joaquin “El Chapo” Guzman for primacy of the drug trade in Mexico.

Gonzalez Valencia was arrested at a beach resort near the coastal city of Fortaleza and brought to the headquarters of the federal police for the state of Ceará, Brazilian prosecutors said in a statement.