"No-one has been arrested or charged and four people including the building manager were treated at the scene by ambulance staff.
Police have appealed to the public for information about the incident.
NUS protest organiser Sarah Garnham said students would meet to consider a response to the incident, which could include legal action.
"Even if we do pursue legal action it's not going to cow us and we're going to continue to take to the streets and confront Christopher Pyne when he shows to public lectures as is our democratic right to do so," she said.
"We don't want the message of the protest to be lost because of what the police did today. The policies of deregulating uni fees will see fees soar to as much as $100,000 per degree.
"It's very much about implementing a carbon copy of the US education model in Australia and students everywhere are really angry about it."
http://www.abc.net.au/news/2015-02-13/students-pepper-sprayed-at-pyne-protest-in-sydney/6090986
It's about the LNP govt taking what was once a govt-funded essential social service and handing it over to private enterprise.
It is philosophically consistent with what the LNP stand for.
They want to privatise everything. healthcare, education, electricity and gas and all of our public assets and essential services, allowing foreign interests to build coal mines on our very best farmlands etc.
They're selling our birthright for a mess of pottage and they're licking out the bowl and smacking their lips for more;
morally bankrupt rich people who act to make the rest of us poor. No wonder they provoke violent protests.
