Police in Colombia have nabbed another suspected drug lord who was found hiding in a secret compartment of a tractor-trailer.

Miguel Angel Mejia Munera was arrested three days after police killed his twin brother.

They are alleged leaders of "The Twins" drug gang, and both of them are sought by the United States for extradition on drug charges.

The US government also offered a five million US dollar reward for each of the twins.

Colombia's Defence Minister, Juan Manuel Santos, said the alleged kingpin will likely be extradited.

"He is ready to be extradited. A five million dollar reward was being offered for his capture. It is possible that he will be extradited, that is most probable. That is what is stipulated by the law, to be extradited."

Santos also said this capture will hit the heart of drug trafficking in Colombia.

The Mejia brothers allegedly began trafficking drugs in the 1990s, according to a US extradition request issued in 2004.

Colombian police have said the brothers were shipping as much as 10 metric tons of cocaine a month to the US and Europe.