Venezuelan authorities have arrested six people suspected of using two drones packed with explosives to assassinate President Nicolas Maduro.
Interior Minister Nestor Reverol said they were arrested on Sunday after seizing several vehicles and carrying out a number of raids on hotels and apartments.
Maduro blamed his political opposition for Saturday's apparent attack at a rally in Caracas, but is yet to provide any evidence.
He also pointed the finger at Colombia and critics in the U.S., adding perpetrators will face "maximum punishment."
Opposition leaders decried his accusations, warning Maduro could use the incident to further suppress his critics during an economic and humanitarian crisis.
Colombia also said the allegations were baseless, while U.S. National Security Adviser John Bolton denied any U.S. involvement.