Russian news reports say President Vladimir Putin has been told of a plot to assassinate him when he visits Iran this week.
The Interfax news sgency said Sunday that suicide bombers have been training to attack Mr. Putin.
The Kremlin has not commented. But a member of Russia's parliamentary security committee tells Russian television that the information came from intelligence sources which could be considered highly reliable.
Iran's Foreign Ministry calls the reports totally baseless and says they are aimed at undermining Russian-Iranian relations.
Mr. Putin is scheduled to arrive in Tehran Monday and plans to meet with Iranian President Mahmoud Ahmadinejad. They plan to attend Tuesday's summit of nations bordering the Caspian Sea.
Some information for this report was provided by AFP and Reuters.