O-Train service has resumed after two men were stabbed at Carleton University on Thursday morning.

OC Transpo suspended O-Train service as Ottawa police investigated a midday stabbing. (Kristy Nease/CBC) A 20-year-old man and a 23-year-old man were involved in an altercation, which took place at about 11:30 a.m., police said.

Investigators combed several scenes at the university, including a southbound O-Train, the O-Train platform and the University Centre building, where blood was spattered on the floor.

Both men were arrested at the university and were taken to hospital with minor cuts.

They are both known to police, specifically the guns and gangs unit. No charges had yet been laid as of Thursday afternoon.

Surveillance video expected

The investigation forced OC Transpo to suspend O-Train service for several hours. Service resumed at about 2:30 p.m.

University Avenue was also closed for a time but has been reopened.

The Ottawa police guns and gangs unit is leading the investigation.

Police said they hope surveillance footage from OC Transpo and Carleton will help their investigation.