CARACAS (Reuters) - Venezuela’s top prosecutor said on Tuesday opposition activist Roland Carreno had been arrested, hours after opposition leader Juan Guaido denounced what he called the “forced disappearance” of the Popular Will party’s coordinator.Chief Prosecutor Tarek Saab wrote on Twitter that Carreno had been detained for alleged “participation in conspirative plans against the democratic peace” and his office had assigned a prosecutor to the case. Carreno was approached on Monday afternoon by unidentified people in vehicles without license plates, Popular Will said on Twitter. It added that the party had been unable to confirm his location after that encounter. “He remains disappeared,” Guaido, head of the opposition-controlled legislature, wrote in a separate post on Twitter. “We alert the world about his forced disappearance and we hold the dictatorship responsible for his physical and mental integrity.” The government of President Nicolas Maduro frequently arrests opposition adversaries, often without due process, rights groups say, and in some cases leaves them incommunicado for hours or days. The Ministry of Information did not respond to requests for comment. Popular Will said it had been unable to locate two men who were with Carreno when he was last seen.