The report says that teams of the Mujahedeen Khalq, an Iraq-based Iranian opposition group, have entered the country to shoot people during the protest rally.

The report by hard-line Fars news agency is seen as a warning to potential protesters that the demonstration will become violent.

Iran’s opposition has called for a rally Sunday to mark a week since the deaths of two people in Feb. 14 clashes between security forces and opposition protesters in Tehran.

It was the largest demonstration by the opposition in more than a year.

The opposition blames the deaths on government forces.