Iran Intelligence Minister Gholam-Hossein Mohseni-Eje'i has warned worshippers against potential unrest in this week's Friday prayers, Press TV reported.
Mohseni-Eje'i called on worshippers to remain 'vigilant' so that the Friday prayers do not turn into a scene of 'undesirable' events, Fars news reported on Thursday.
The minister however added that the capital, Tehran, currently enjoys a good security situation.
After an eight-week absence, Chairman of the Expediency Council and head of the Assembly of Experts, Ayatollah Akbar Hashemi-Rafsanjani, will lead this week's Friday prayers.
Supporters of Iran opposition, who continue to reject the results of the June 12 presidential election, will reportedly take part in this week's Friday prayers en masse as defeated presidential candidate Mir-Hossein Mousavi has announced that he will also take part.
In a statement issued by his website Ghalamnews on Wednesday, Mousavi, the country's last prime minister, who placed second in Iran's June 12 presidential election, announced that he would join the lines of worshippers for this week's Friday prayers.
Mousavi said he would attend the prayers as he feels 'obliged' to respond to calls concerning the path of defending the 'legitimate rights to a free and decent living.'
Iran became the scene of rallies after Mahmoud Ahmadinejad was re-elected for another four years. In post-vote unrest, 20 people were killed and many others were injured.