The province's Special Investigations Unit is probing the death of a man who allegedly attacked passengers and the bus driver on a GO bus in Mississauga early Sunday morning.

Peel Regional Police received a call at about 2:15 a.m. about a man who was reportedly behaving strangely on the bus, which sat on the highway off-ramp to Terminal 3 at Toronto Pearson International Airport.

In a statement released Sunday, the SIU said the man lost vital signs after being restrained by police. He was taken to Etobicoke General Hospital, where he died.

None of the other passengers suffered serious injuries or were taken to hospital.

The SIU is currently investigating how the man died. Anyone who may have information is asked to contact them at 416-622-1886 or 1-800-787-8529 ex. 1886.