OAKLAND, Calif. (AP) - A man was shot and killed Thursday just outside the Oakland encampment that anti-Wall Street protesters have occupied for the last month, causing a scream-filled commotion in the City Hall plaza where the camp stands and turning a planned anniversary celebration into a somber, candlelit memorial.

And in Vermont, a 35-year-old military veteran fatally shot himself in the head Thursday at an Occupy Wall Street encampment in Burlington, Vermont's largest city.

With opinions about Occupy Oakland and its effect on the city having become more divided in recent days, supporters and opponents immediately reacted to the homicide - the city's 101st this year.

Camp organizers said the attack was unrelated to their activities, while city and business leaders, cited the death as proof that the camp itself either bred crime or drained law enforcement resources from other parts of the Oakland.

Mayor Jean Quan, who has been criticized by residents on both sides for issuing mixed signals about the local government's willingness to tolerate the camp, issued a statement Thursday providing a clear eviction notice.

"Tonight's incident underscores the reason why the encampment must end. The risks are too great," Quan said. "We need to return (police) resources to addressing violence throughout the city. It's time for the encampment to end. Camping is a tactic, not a solution."

For their part, protest leaders said the shooting involved outsiders and was only connected to their ongoing protest of U.S. financial institutions to the extent that poverty breeds violence.

In Vermont, Burlington police said the name of the Chittenden County resident is being withheld because his family has not been fully notified.

The man shot himself inside a tent in City Hall Park on Thursday afternoon. Mike Noble, a spokesman for the Fletcher Allen Health Care hospital in Burlington, confirmed that the man had died. Noble said he could provide no other details.

In a statement issued late Thursday, Occupy Burlington said, "We mourn the loss of a great friend tonight, while discovering an ever-deeper resolve to stand with our most vulnerable citizens."

Protesters at the Occupy encampment say the man was a victim of inadequate mental health services being offered to veterans.

"This person has clearly needed more help than we were capable of giving him here at this park," said Emily Reynolds, a University of Vermont student and a leader in the local Occupy movement.