Police arrested four people and seized a ton of cocaine that was bound for export, Colombian authorities said Friday.

Officers also destroyed a clandestine drug lab during Thursday's operation in a rural area of the northwestern province of Antioquia, the National Police said in a statement.

The people arrested were part of a drug-trafficking organization led by Oviedo Isaza Gomez, son of former rightist militia chief Ramon Isaza, who was extradited to the United States on drug charges in May 2008.

The cocaine "was on route to ports on the Atlantic coast," where the drugs were to be loaded onto container ships bound for Central America, the National Police said.

The intended final destination of the $30 million consignment was the United States, according to the statement.