UPDATE 3: From Saeed Valabaygi: "Plainclothes forces with hot and cold weapons(gun and knife) along with organized cyclists attacked some of the politechnic dormitories. Plainclothes forces in a attack to Golashan dormitory in Beh Afarin St beaten up several students and dormitory's guards."
UPDATE 2: Reportedly, the owner of the openDemocracy blog, who has written about equal rights for women, has been arrested.
UPDATE 1: The BBC is confirming heavy riot police and Basij presence at and around Tehran University and the use of tear gas and the cut-off of mobile text messaging services. Reportedly arrests have been made, including the arrest of Mohammad ali Dadkhah, a lawyer representing the Human Rights Defender's Center.
Revolutionary Road is live blogging protests in Tehran that are being held on the tenth anniversary of the 1999 student uprising. If you're on Facebook, you can link to Saeed's FB updates off the Revolutionary Road website. He's reporting seeing military helicopters, tear gas attacks, random Basij attacks on buses and bystanders, and protests at the Chinese embassy.
The BBC has documented protests and clashes beginning yesterday, as has the Associated Press.
More to follow later this afternoon.