Octavio Hernandez, also known as El Chapito Leal (Loyal Little Boss), is believed to be a key part of the powerful Sinaloa drug cartel.
He was arrested during a police and military operation in the city of Tijuana, in the north-western Mexican state of Baja California.
According to local reports, he was one of a number of suspected cartel members grabbed as they left a restaurant.
And in their vehicle were four short firearms, two automatic rifles, chargers and cartridges, it is reported.
Video shows Hernandez flanked by two masked officers, wearing bullet-proof vests and carrying large rifles.
They march him into a secure van, surrounded by photographers and people filming.
After his capture, the convoy of security vehicles went to the headquarters of the state's federal police force.
This is the second time Hernandez has been captured in Tijuana. In 2012 he was arrested by the army at an address in Aguacaliente but released in 2015.
According to the State Department for Public Security, El Chapito Leal Hernandez acts as a lieutenant to cartel leaders Alfonso and Rene Arzate Garcia, known as El Aquiles (Achilles) and La Rana (The Frog).
The Sinaloa cartel, active since 1989, is known for its international drug-trafficking and money-laundering operations.
The USA’s intelligence services have called it "the most powerful drug trafficking organisation in the world".
I am not sure how key of a figure he really was, I knew a lot about his history when he was arrested in 2012, he was kinda on with Inge, but not really, and running from Aquiles and La Rana, for not paying plaza. He's been out a year, and got caught again, usually unless you are really well respected and up, you aren't really accepted back. He gave statements regarding Los Aquiles when he was arrested, including their locations and organizational structure. I think they let him come back, and let him work, and pay a little plaza. Again, he got caught with about the same things as in 2012.
Re: 'Most powerful' Mexican drug cartel boss arrested by armed police
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He lives en LA Sanchez. "ute ta Loco coño hermano"!estan Los monito's wey ya se armaron. toda la gente del aquiles se le anda voltoando Asta El ranitas ya se canso estar esperando y caguamiando en la esquina!!