Iran's police chief is accusing opposition leaders of provoking instability, after they called for a referendum on the government's legitimacy.
The official IRNA news agency on Tuesday quoted Esmail Ahmadi Moghaddam as saying those who do not abide by law are "liars" who seek to create discord by spreading doubt in the Islamic republic.
On Monday, former Iranian President Mohammad Khatami called for a nationwide referendum on the government, in a bid to end Iran's post-election crisis.
Defeated election candidate Mir Hossein Mousavi has continued to dispute the June 12 election result, even though Supreme Leader Ayatollah Ali Khamenei has endorsed the re-election of President Mahmoud Ahmadinejad.
Tuesday, the editor Hossein Shariatmadari of the hardline Kayhan newspaper, who is close to the supreme leader, criticized the opposition's call for a referendum as a "Western plot" aimed at creating chaos.
In a speech to officials Monday, Khamenei said Iran's elite should avoid making comments that can, in his words, help the country's enemies. He also lashed out against the West for allegedly meddling in Iran's affairs.
Some information for this report was provided by AFP and Reuters.