Czech President Milos Zeman has cast doubt on Russia's involvement in a 2014 explosion at an arms depot.
President Zeman has suggested the deadly blast could have been caused accidentally due to the mishandling of explosives and says there is no conclusive evidence to charge Russia over the alleged sabotage.
Prague caused an unprecedented diplomatic crisis by accusing two Russian GRU intelligence agents of involvement in the blast in Vrbetice, which killed two people.
Czech prime minister Andrej Babis had said that there was "irrefutable evidence" to charge the Russian nationals, following investigations by the Czech counterintelligence service.
But the pro-Russian President contradicted his government's stance in a televised address on Sunday.