The Mexican government says there are some 1,000 kidnappings a year in the country, but it's thought the figure is closer to 100,000.

Kidnapping is a lucrative business, and kidnappers can earn millions of dollars.

The BBC met "Crack" who says he is a kidnapper. He spoke to Vladimir Hernandez for the Our World film: Kidnapped in Mexico.

The BBC cannot independently verify his claims.

This video contains graphic descriptions of violence and some strong language.

Watch the Our World film (global times), or watch in the UK.