Gunshots were heard at a rally led by Venezuelan opposition leader Juan Guaido outside a Caracas air base, Reuters witnesses said, after Guaido said earlier that troops had joined him to oust President Nicolas Maduro. Gunfire heard outside of La Carlota airbase, forces loyal to Guaido are clashing with Maduros security forces#Venezuela pic.twitter.com/INPzZDB1cU — CNW (@ConflictsW) April 30, 2019 Reuters witnesses said men in military uniform, who were accompanying Guaido at the scene, were exchanging fire with soldiers acting in support of Maduro. The witnesses said the shots appeared to be live rounds.