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(CNN) -- Iranian authorities have blocked the word "Bahman" -- the 11th month of the Persian calendar -- from Internet searches within the country, according to an opposition website.

The measure appears to be an effort by Iranian authorities to obstruct access to several websites that are promoting a rally on Monday -- the 25th day of Bahman -- proposed by Iranian opposition leaders in support of the uprising in Egypt, Saham News reported Saturday.

Two Tehran residents also confirmed the block via e-mail to CNN.

Iranian authorities on Wednesday warned against any attempt by the opposition movement to hold the rally, according to the state-run Islamic Republic News Agency.

"We definitely see them as enemies of the revolution and spies, and we will confront them with force," Revolutionary Guard Cmdr. Hossein Hamedani told IRNA.