Witnesses said that a man dressed in black had fired a gun multiple times.
The charred remains were on Friday identified as those of three family members: 51-year-old Rajiv Warikoo; his wife, 47-year-old Shilpa Kotha; and their 16-year-old daughter, Mahek Warikoo.
Around 200 people were inside when a Hindi film was playing at the time, according to police.
After ploughing the van into crowd the suspect told police officers that he had a weapon and said, "Shoot me in the head."
Gurvinder Nath was delivering pizza at around 2:10 am on July 9 in Mississauga's Britannia and Creditview roads, when unknown suspects confronted him and tried to steal his vehicle, CTV News channel reported.
Seventeen Indo-Canadians, including NDP leader Jagmeet Singh and Defence Minister Harjit Sajjan, won Canada's parliamentary elections on Tuesday with Liberal Party leader and Prime Minister Justin Trudeau returning to power in the snap polls.
The motive of the crime is still unclear.
Supninder Singh Khehra, an Indian citizen from Patiala and a resident of the Toronto suburb of Brampton, was verbally abused and beaten by a group of men who seemed to be drunk.