Gatineau police arrested a university professor Tuesday as some students refused to leave campus during a tuition fee protest.

Students and professors blocked traffic outside Universite du Quebec en Outaouais Tuesday morning, surrounding a police vehicle after the professor was arrested for obstructing police.

"Our professor has been arrested for nothing so we're protecting him, they can't go with him," said student Bob Bissonnette.

Professors said social sciences professor Tibo Martin was trying to get belongings inside the school when he was pushed to the ground and arrested during police evacuation.

His colleagues said they've hired a criminal lawyer because he was injured.

Monday, UQO students and teachers barricaded themselves inside the school as they challenged an injunction that forced them to return to class.

When that injunction was upheld, the students left the school peacefully.

University acted for students who want to go to class

The province-wide protests and student strikes are over $1,625 in tuition increases in Quebec over the next five years, with some UQO students out of class for over three weeks.

The university said they called in police to enforce the injunction so students who wanted to go to class could do so.

"I'm the one who asked the police to intervene because after an injunction . . . there were people who were still defying the law," said UQO director Jean Vaillancourt.

Students who wanted to learn were let inside with proper ID, but even then some didn't have professors to teeach them.

"I just want to go to my courses," said student Melissa Cole.

Concerns are starting to be raised that students could be putting their semesters at risk if they continue to stay out of class.

Martine Desjardins, president of the Quebec Federation of University Students, told CTV's Canada AM the student movement is aware that thousands are at risk of not completing a semester.

"We are very concerned but we're trying to make a point here and we're trying to have a discussion with the government," said Tuesday.

UQO has extended its semester to end on May 4, with students who continue to strike running the risk of losing their term's worth of work.

With a report from CTV Ottawa's Joanne Schnurr