Venezuelan President Nicolas Maduro said his security forces prevented a “false flag operation” to plant explosives at the United States Embassy in the capital Caracas in order to heighten tensions with Washington, amid a US military build-up off the coast of the Latin American country. In a televised interview late on Monday, Maduro said two reliable sources, one domestic and one international, had informed the government of the possible attack by “extremist sectors of the local Venezuelan right” and security forces were sent to reinforce the embassy. News of the alleged plan to attack the embassy comes as US President Donald Trump is reported to have called off efforts to reach a diplomatic agreement with Venezuela, telling his special envoy Richard Grenell – who had been leading negotiations with Maduro’s governme