OAKLAND, Calif. — Anti-Wall Street protesters filled a street with a late-night march Wednesday and Oakland's police chief pledged a vigorous investigation into an earlier clash between police and protesters that left an Iraq War veteran in critical condition with a fractured skull.
Police Chief Howard Jordan spoke as tensions grew over demonstration encampment in the Bay area.
"It's unfortunate it happened. I wish that it didn't happen. Our goal, obviously, isn't to cause injury to anyone," the chief said at an afternoon press conference.
Scott Olsen, 24, suffered a fractured skull Tuesday in a march with other protesters toward City Hall, said Dottie Guy, of the Iraq Veterans Against the War. The demonstrators had been making an attempt to re-establish a presence in the area of a disbanded protesters' camp when they were met by officers in riot gear.
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It's not known exactly what type of object struck Olsen or who might have thrown it, though Guy's group said it was lobbed by officers. Several small skirmishes had broken out in the night with police clearing the area by firing tear gas and protesters throwing rocks and bottles at them.
An Oakland hospital spokesman said Olsen, a network administrator in Daly City, was in critical condition Wednesday.
"The irony is not lost on anyone here that this is someone who survived two tours in Iraq and is now seriously injured by the Oakland police force," his friend, Adele Carpenter, 29, alleged in a phone interview with Reuters from the hospital waiting room.Video: Tensions rise at ‘Occupy Oakland’ protests (on this page)
Earlier, Oakland officials allowed protesters back into the plaza outside City Hall where their 15-day-old encampment had been raided the day before, but said people would be prohibiting from 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 sad day'
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.
It wasn't immediately clear how many people were left in the plaza, where some had vowed to spend the night.Story: Income of top 1 percent far outgrew others: report
"I'm going to stay here tonight," said Jhalid Shakur, 43, of Oakland. "I don't have a tent, but I'll sleep on a bench if there's space."
"We're about to build our city back," he said.
"We had, on one hand, demonstrators who tried to rush banks, other demonstrators saying don't do that, and we had police officers, for the most part, 99 percent, who took a lot of abuse," the mayor said. "So yesterday was a sad day for us."Feeding the movement: How Occupy protesters are eating
Jordan, the police chief, said an internal review board and local prosecutors have been asked to determine if officers on the scene used excessive force. He asked witnesses with recordings of violent interactions between civilians and the officers who came from several Bay Area agencies to submit them to investigators.
The clash Tuesday evening came as officials complained about what they described as deteriorating safety, sanitation and health issues at the dismantled camp.
Plea for peace
Oakland City Administrator Deana Santana said protesters would be allowed to assemble in the plaza outside City Hall from 6 a.m. to 10 p.m. She pleaded with those who planned to make another stand there to refrain from smashing windows, lighting fires and attempting to stay overnight.
"If we could have these simple, reasonable requests, we think we can assure safety in the streets tonight," Santana said.
At 10 p.m. there was only one tent on the plaza, SFGate.com reported.
The same concerns were being raised by San Francisco officials who warned protesters Wednesday that they could face arrest if they continue camping in a city plaza. In a letter, Police Chief Greg Suhr said the protesters could be arrested for violating a variety of city laws against camping, cooking, urinating and littering in public parks.
"Existing and ongoing violations make you subject to arrest," Suhr wrote in the notice, but didn't say if or when arrests would occur.
Police have taken down a previous Occupy San Francisco camp in the Justin Herman Plaza and also cleared another camp outside the Federal Reserve Bank downtown.
Late Wednesday some of the San Francisco protesters, estimated to be about 200 people, had their arms locked and were practicing trying to keep police from entering the perimeter of their encampment.
In Portland, Oregon, a crowd estimated to number at least 1,000 joined in a march organized by the AFL-CIO labor federation in support of the anti-Wall Street movement.
Demonstrators also rallied peacefully in San Francisco, and Twitter buzz suggested turnouts may have gotten a boost from outrage generated by news of the injured Oakland veteran.
Supporters in New York voted on Wednesday to send $20,000 and 100 tents to their peers in Oakland, according to a Twitter message from a protester identified as J.A. Myerson and re-tweeted by the Occupy Wall Street group.
The Associated Press and Reuters contributed to this report.