Two TTC employees were attacked on a bus in Scarborough Monday afternoon in what TTC describes as a swarm or herd style assault.

The alleged assault took place near Kennedy and Merrian roads around 3:35 p.m.

Police say there are reports that a group of 10 to 15 youths assaulted uniformed officers on the bus before fleeing the area.

No suspect descriptions have been released at this time.

"There were two TTC operators on duty who were on their way to an aid station to pick up their vehicle and complete their shift and were attacked, as described by police, by a group of 10 to 15 people," said Stuart, a TTC spokesperson.

"At this time, we are working with police to pull video and obtain any evidence we can as they investigate this despicable act. It is absolutely unforgivable."

The victims were treated at the scene by paramedics, but did not require hospitalization.

He said the bus operator was not physically injured, but was "emotionally shocked" by the incident.

Mayor John Tory commented on the incident urging anyone with information to contact police and also expressed grave concern "about the increasing number of criminal acts involving young people."

"I firmly believe this is something all governments must work together to address urgently with social and mental health experts," Tory said in a tweet Monday night.