Scott Olsen, a 24-year-old Iraq war veteran, suffered a fractured skull Tuesday in a march with other protesters toward City Hall. Police Chief Howard Jordan said at a late afternoon news conference that the events leading up to Olsen’s injury would be investigated as vigorously as a fatal police shooting. Although the object that hit Olsen in the head is still unknown, it appears to have been a teargas canister, part of several rounds of teargas deployed by Oakland PD last night.

See more videos and pictures here : Occupy Oakland protester Scott Olsen critically injured after being hit by police.

“It’s unfortunate it happened. I wish that it didn’t happen. Our goal, obviously, isn’t to cause injury to anyone,” Howard Jordan said.

Following news of the Iraq veteran’s injuries, Occupy Oakland organizers have announced their plans for a peaceful vigil in Olsen’s honor.