At about 2 a.m. on March 21, eight Venezuelan intelligence agents drove to the home of the top adviser to opposition leader Juan Guaido and broke down the door.

They searched the bedroom of their suspect — Guaido's chief of staff, Roberto Marrero — finding two military-style rifles and a grenade, the agents said in sealed court records reviewed by Reuters and being made public for the first time.

The Sebin intelligence agency, controlled by embattled socialist President Nicolas Maduro, had detailed its evidence against Marrero in two reports that agents said they had compiled six days earlier, on March 15, the court records show. The reports accused Marrero of smuggling guns and explosives from Colombia and posting social media messages that prosecutors called treason.