http://www.france24.com/en/20090614-foreign-media-say-i... You can see the riot police using their batons. These are pics from afar, but the results from the close-up shots in the OP look like they would be the result.
Another picture bears a caption about the protesters there being tear-gassed.
From the story there, video is being confiscated and reporters from different countries are being prevented from reporting, some to the point of being ordered to leave Iran.
"An Iranian demonstrator runs for cover as policemen use tear gas to disperse the crowd during a protest against the election results outside Tehran University. "

"An Iranian riot police officer attacks a man with a stick near Tehran University."