Witnesses said thousands of riot police and Revolutionary Guard members armed with tear gas, batons and firearms are deployed outside Teheran University to prevent student demonstrations backed by the opposition.
Monday's large security operation suggested that authorities plan to make good on their promise to deal harshly with protesters marking the day in 1953 when three students were killed in an anti-US protest.
There was no word yet on whether demonstrations began inside the campus, but the witnesses said police were conducting ID checks on anyone entering the campus to prevent opposition activists from joining the students.
Journalists working for foreign media organizations are banned from covering Monday's planned protests.
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