More pro-government rallies are planned in Iran after Friday prayers while activists have posted new videos purporting to show protests challenging the Islamic Republic's government.

Activists describe the protest videos, obtained by The Associated Press outside of Iran, as showing demonstrations in Tehran on Thursday night, including chants against Supreme Leader Ayatollah Ali Khamenei.

In Tehran on Friday morning, streets appeared calm ahead of noon prayers.

An emergency meeting of the U.N. Security Council, called for by the United States, is to discuss the ongoing unrest later Friday.

At least 21 people have been killed in the unrest surrounding the protests, which began last week over rising food prices and Iran's flagging economy before spreading to cities across nearly all of Iran's provinces. Authorities have said the protests are waning.