Mexican authorities have arrested the leader of a Colombian drug cartel responsible for nearly half of the cocaine smuggled into the United States, the U.S. Embassy in Mexico said Friday.

The arrest of Jaime Maya-Duran "shows the determination of U.S. and Mexican law enforcement authorities to pursue the most dangerous criminals, including those who thought they were untouchable," U.S. Ambassador Tony Garza said in a news release.

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Maya-Duran was arrested Sept. 6 by agents of Mexico's Attorney General's Office. It was not immediately known where he was arrested and Mexican officials could not be reached for immediate comment.

CountryWatch: Mexico