Iran’s opposition People’s Organization of the Mujahideen in Exile announced that its activists inside the country carried out a cyberattack that it says allowed it to temporarily control dozens of websites owned by Tehran’s municipality, in addition to thousands of surveillance cameras in the capital.

In a statement, she explained that the cyberattack was carried out “as part of a major pre-planned operation,” noting that the attack on Tehran’s municipality websites included displaying photographs of Massoud, leader of the People’s Mujahideen-e-Khalq. Rajavi, who has not appeared in public for years, and his wife Maryam Rajavi, as well as Slogans against Supreme Leader Ali Khamenei.

The organization said the operation included sending text messages to 600,000 people from Tehran, and also included MKO supporters monitoring more than five thousand surveillance cameras throughout the city, including cameras placed near the office of the Supreme Leader and the grave of the founder Islamic Revolution by Ruhollah Khomeini.

Iranian official media previously reported that the internal information system of the Tehran municipality was subjected to a “deliberate” operation, the perpetrators of which were not identified.