Update: Oakland Officers Facing Major Investigation Over Critical Injury to Iraq War Vet

The police officers involved in the action that left an Iraq War veteran in critical condition during the Occupy Oakland crackdown on Wednesday now face a major, "level-one" investigation, Police Chief Howard Jordan told KGO-TV. What does that mean? Well, the investigation will be treated as if the officers had used lethal force.

"A Level 1 investigation involves not only Internal Affairs, but the district attorney and the office of the Inspector General," reports Business Insider.

(Related: Read about Olsen's incident and injuries)

"It's at the top of our list and we are gathering footage and investigating whether or not it was justified," Jordan said.

"It's unfortunate it happened. I wish that it didn't happen. Our goal, obviously, isn't to cause injury to anyone," he added, according to the Associated Press.

The investigation announcement comes as new video posted on YouTube shows the moment Olsen was injured. It also appears to show a police officer hurling a flash bang grenade at the protesters who rush to his aid (CONTENT WARNING  for language):

Business Insider also reports the actions of the police could have violated their own department’s Crowd Control & Crowd Management Policy, including a section that notes injured persons shall be given medical attention:

Below is section two from the Oakland Police Training Bulletin.

b. The use of Direct Fired SIM must cease when the violent or destructive actions cease. These weapons must not be used for the purpose of apprehension or to otherwise prevent escape unless escape would present a substantial risk of continued imminent threat to loss of life or serious bodily injury.

c. Members shall only deploy Direct Fired SIM during a demonstration or crowd event under the direction of a supervisor. Oakland Police Department, 28 Oct 05 17

d. When circumstances permit, the supervisor on the scene shall make an attempt to accomplish the policing goal without the use of Direct Fired SIM as described above, and, if practical, an audible warning shall be given to the subject before deployment of the weapon.

e. Any person struck by a round shall be transported to a hospital for observation and any necessary treatment. Ambulance service, if required, shall be ordered per General Order I-4. First aid, when necessary, shall be administered per Training Bulletin III-K.

f. No member shall use Direct Fired SIM without formal training.

g. Direct Fired SIM shall not be used against a person who is under restraint.

h. Members shall not discharge a Direct Fired SIM at a person’s head, neck, throat, face,

left armpit, spine, kidneys, or groin unless deadly force would be justified

"It's really sad and it makes me angry that he was in Iraq without any injuries and then to come here and be shot by the same people that were supposed to be protecting him instead of shooting him," Shannon said.

Business Insider has the rest of the manual.

"It's really sad and it makes me angry that he was in Iraq without any injuries and then to come here and be shot by the same people that were supposed to be protecting him instead of shooting him," Olsen's roommate said.

In response to the injury, Oakland protesters took the streets again on Wednesday. Oakland Officials, however, didn't resist the demonstrators, allowing protesters back into the plaza outside City Hall where their 15-day-old encampment had been raided the day before. Still, they said people would be prohibitedfrom spending the night.

About 1,000 people quickly filled the plaza, but later many of them filed out and began marching down nearby streets.

A reporter at the scene says police erected wooden barricades to block the march, but the protesters veered off as a group and continued down another street.

There were no signs of clashes between the two sides.

The Associated Press contributed to this report.