Omar Trevino Morales (front L), known as the Z-42 leader of the Zetas drug cartel, is escorted by soldiers during a media conference on his arrest, in Mexico City March 4, 2015. Omar Trevino, brother of captured ex-Zetas leader Miguel Angel Trevino, was caught by Mexican soldiers and the federal police in the northern city of Monterrey at around 4 a.m. local time on Wednesday, a senior government official said. REUTERS/Edgard Garrido (MEXICO - Tags: CRIME LAW DRUGS SOCIETY)