Colombia's Secret Police Activities Exposed

The Colombian secret police, also known as DAS, has come under fire after leaked internal documents showed the organisation's use of death threats, intimidation and illegal phone tapping.

The documents showed what appears to be a political war against journalists, opposition groups and even members of the supreme court.

The evidence has led to the arrest of five former secret police officials.

Alvaro Urive, the Colombian president, has said he did not know about the unlawful activity, but the leaked papers appear to show links between the secret police and government officials.

Teresa Bo reports from Colombia's capital, Bogota.