Alek Minassian, 25, who was arrested on suspicion of bloodshed Monday night in Toronto, Canada, has been charged with 10 counts of first-degree murder and 13 counts of attempted murder.
He is thought to be the driver of the van, which crashed into a crowd at a busy Canadian intersection, killing 10 people and injuring 15 others.
After the charges were announced, he did not file an objection to the charges, and is being taken to court again on May 10.
This is the worst mass murder in Canada in decades.
Toronto Police are trying to find the motive of the driver.
Meanwhile, a possible scenario is for the 25-year-old, because he was frustrated and socially unacceptable, to be outraged that women rejected him sexually, while he had expressed positions in favor of a similar incident.
On his Facebook profile, he posted a post praising Elliot Rodger, who killed six people and injured 14 others in the 2014 attack on the University of California.
Rodger had fallen on his car to pedestrians, shooting and stabbing passers-by.