BBC: It is "unclear" whether Russian President Vladimir Putin's planned visit to Iran on Monday will go ahead, his spokesman has said.
"I can't confirm or deny that this visit will happen," Dmitry Peskov told the BBC, without elaborating.
Earlier, the Interfax news agency cited unnamed Russian security service sources as saying suicide bombers were plotting to kill Mr Putin in Tehran.
Iran's foreign ministry dismissed the reports as "completely baseless".
Foreign ministry spokesman Mohammad Ali Hosseini said Mr Putin was due to arrive in Tehran on Monday evening, before attending a summit of Caspian Sea heads of state on Tuesday.
Mr Putin would be the first Russian leader to visit Iran since Soviet dictator Joseph Stalin went there in 1943. Putin's visit to Iran 'unclear' (more)
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Mark Alexander
