The United States is increasingly concerned after top secret documents showing Israel‘s plans for a potential retaliatory strike on Iran were leaked to an Iranian Telegram account on Friday.

The documents, which have markings showing they are only to be seen by the U.S., United Kingdom, Australia, Canada, and New Zealand, describe Israel moving munitions around and Israeli air force exercises involving air-to-surface missiles, seemingly in preparation for an attack on Iran, according to a CNN report.