First , it arrested Zetas regional boss Carlos del Valle . Oliva Castilo began working for the Zetas in 2005 in Tamaulipas , the defense ministry said , and rose through the ranks quickly . He was as high as third in the group . Cartel members tried to rescue him from authorities .
First , it arrested Zetas regional boss Carlos del Valle . He was as high as third in the group . Cartel members tried to rescue him from authorities .