In a statement posted on X, Iranian foreign minister Seyed Abbas Araghchi said: "We are seeing stories in the media that Iranian nationals are allegedly involved in a supposed plot to target the Israeli embassy in London.
"Iran in no uncertain terms categorically rejects any involvement in such actions and confirms that we have not been informed of any allegations via proper diplomatic channels".
"Iran has urged the UK to engage so that we may assist any probe into credible allegations. Timing and lack of engagement suggest that something is amiss."
The Iranian foreign minister said there was a "history of third parties bent on derailing diplomacy and provoking escalation, resorting to desperate measures, including false flag operations".