Colombian police hunt most wanted drug baron 'Otoniel'

A massive security operation is under way in north-west Colombia, near the border with Panama, looking for a man known as "Otoniel".

The man, who's full name is Dairo Antonio Usuga David, is said to be the head of the so-called Usuga clan, one of the biggest drug organisations in Colombia.

The Usuga Clan was once part of a brutal paramilitary group. Now it controls vast swathes of rugged territory, from where it exports cocaine to Central America, the United States and Europe.

The BBC's Natalio Cosoy has been given special access to this massive police operation trying to find him.