A former York University employee has been arrested after three women were assaulted at the school in March, Toronto police say.

The alleged sexual assaults occurred in the York Lanes and Vari Hall areas of the school near Keele St. and Steeles Ave. W. beginning on March 3, police said.

A woman was approached at the school library by a man who tried to start to start a conversation. When the woman attempted to walk away, he sexually assaulted her, police said. She was able to flee shortly after.

On March 17, police said the man sexually assaulted an 18-year-old woman twice in the same day at York Lanes.

A week later, a 20-year-old woman was sexually assaulted after being approached by a man while she was walking to Vari Hall. He later fled the scene.

Keith Johnathan Jarrett, 27, of Toronto, has been charged with four counts of sexual assault.

He is a former student at the university, as well as an ex-employee, police said.

Jarrett ran for the Green Party in Humber River-Black Creek in the 2015 federal election.

“He is not currently a member of the Green Party of Canada,” party spokesperson Dan Palmer told the Star.

“The party takes the issue of sexual assault very seriously. Our vetting process stipulates that no one with a criminal past is eligible for candidacy.”