Maduro told a meeting of South American foreign ministers that the three generals, who were not identified, had been in contact with the opposition and "were trying to rise up against the legitimately constituted government."
"This group that was captured has direct links with sectors of the opposition and they were saying that this week was the decisive week," Maduro said.
He said the generals had already been summoned before a court martial, adding that the plot was discovered because other officers had come forward to say they were being recruited.