Updated

Anti-drug police have dropped thousands of leaflets from helicopters over a Colombian border area offering a $5 million reward for a drug lord implicated in attacks on officers.

The leaflets were dropped over the town of Apartado, which is near the border with Panama.

Dario Antonio Usuga, the Colombian-born leader of the Gulf Cartel and also known as Otoniel, is the target of the reward offer. Rewards of $800,000 have been set for two of his top associates.

Colombia's Gulf gang has been implicated in the shooting deaths of many of the dozen police officers killed in the border area over the last month.

Gen. Jose Mendoza, director of the anti-drug police, said the leaflets are also aimed at locating drug plantations and production labs. Mendoza led efforts to hand out leaflets on the ground Thursday.