Bogota, Colombia (CNN) New videos obtained by CNN provide chilling insight into a mystery drone attack against Venezuelan president Nicolas Maduro last year—the world's first known attempt to kill a head of state with a retail drone, purchased online and armed by hand with military grade explosives.

One man has come forward as an organizer of the attack, saying it was perpetrated by a group of Venezuelan Army defectors and others. In an exclusive interview with CNN, he recounted how they prepared for the attack, and provided cell phone videos of their drones, explosives, and practice flights in the rural farmlands of Colombia.

"We have tried every peaceful and democratic way to bring an end to this tyranny that dresses itself as democracy," he told CNN on condition of anonymity, referring to the Maduro regime. "We have friends who are in custody, tortured. This was a hard decision."

He also acknowledged that the attack could have killed innocent civilians alongside their target. "That was the risk we had to take," he said. "We cared about that as the Venezuelan people are always the ones feeling the consequences."

Security forces check a nearby building after an explosion was heard during Maduro's speech.

The self-declared interim president of Venezuela, its opposition leader Juan Guaido, told CNN he disapproved of the attack.

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