India, June 23 -- Iran had communicated to US President Donald Trump that it could activate sleeper-cells terror inside the United States if the country is attacked.

The communication was made last week, days ahead of the US surprise attack on three Iranian nuclear sites - Fordow, Natanz, and Esfahan - making an official entry into the Middle East conflict.

The message was delivered to the US President through an intermediary at the G7 summit in Canada last week, which Trump left early amid escalating conflict between Iran and Israel, NBC reported quoting US officials. Israel Iran war LIVE Updates

However, neither the US nor the Iranian Mission to the UN has responded to the report.

The report, quoting a European diplomat, further sai...