Nearly two dozen people have been arrested at Dalhousie University homecoming parties.
Halifax Regional Police say between 1,200 and 1,500 students descended in an area near Jennings Street.
Police say they had seen social media posts alerting them to the potential of large gatherings in the south end.
Dalhousie officials say extra duty-officers were hired to support police in the area, but reinforcements from other parts of the city had to be called in.
Officers took 22 people into custody for various liquor control, criminal code and by-law violations and say they continue to patrol the area.
On Twitter, Dalhousie president Richard Florizone says he's disappointed to hear some students were drinking excessively and disturbing the community.
He adds in addition to any legal issues they face, students could be subject to university discipline.