Police are investigating claims officers used "disproportionate force" during a protest at the University of Warwick.
Three people were arrested on Wednesday as about 25 students demonstrated against rising tuition fees.
Video on YouTube showed police using CS spray and threatening protesters at the Coventry campus with a Taser.
West Midlands Police said the videos would be examined and it expected the highest standards from all officers.
Security staff at the university said they had faced a "shocking and totally unprovoked act of violence" from protesters, prompting them to call police.
One person was arrested on suspicion of assault, another two on suspicion of obstruction. All three have since been released on police bail.
A statement on the Warwick Free Education website said demonstrators were "punched, pushed on to the floor, dragged, grabbed by the throat and rammed into a wall and kneed in the face".
Warwick Students Union said that based on video footage online "we absolutely believe that disproportionate force was used against protesters".
As a result, it said some students were "unnecessarily harmed".
Some video clips have since been removed from YouTube.
Coventry Police Commander Ch Supt Claire Bell said: "Police officers are highly trained in dealing with all public order situations and using appropriate levels of force.
"We are aware of videos of the protest being circulated on social media sites, which will be examined.
"We expect the highest standards from all officers, and if any officer is found to have fallen below these standards in any way, they will be thoroughly investigated."
West Midlands Police said a Taser was drawn as a warning, but was not fired, while CS spray was used when it was felt a group was advancing on officers.