Mario Armando Ramirez Trevino was captured near the U.S. border . CNN 's Nick Parker , Catherine E. Shoichet and Ana Melgar contributed to this report . The Mexican government said it had arrested a man who is believed to be responsible for kidnapping and killing two American citizens in southern Mexico last month. The group has suffered a series of blows recently , including the arrests of two top lieutenants .
Mario Armando Ramirez Trevino was captured near the U.S. border . The Mexican government said it had arrested a man who is believed to be responsible for kidnapping and killing two American citizens in southern Mexico last month. The group has suffered a series of blows recently , including the arrests of two top lieutenants .