OAKLAND — Occupy Oakland campers are looking over their shoulders these days, as the feeling is it’s not if police will forcibly remove them, it’s when.

For the second time in 24 hours, police distributed eviction notices to protesters at Frank Ogawa Plaza and Snow Park on Saturday morning. A homicide on the encampment’s doorstep, camp crackdowns in other Occupy establishments across the country and ramped up rhetoric have created a tense community, although it did not stop a spirited march Saturday evening.

“A raid of the camp seems absolutely imminent,” said Shon Kae of Occupy Oakland, “but it is important to get our facts right, or we risk breeding fear and paranoia at times when people should be thinking clearly and making decisions based on clear thought and facts.”

City officials say the warnings have dropped the tent census from 180 last Tuesday to 160. About 20 tents remain at Snow Park near Lake Merritt.

Police first passed out the warning letters Friday evening by order of Mayor Jean Quan, which many campers read and then burned.

The move followed the shooting death of a man in his 20s at 14th and Broadway on Thursday evening, a few feet from the encampment. The suspects have links to Occupy Oakland, police say, but are still unsure if the victim was related to the movement. No arrests have been made and the name of the victim has not been released pending notification of his family, police said.

City and police officials remained mum Saturday on any raid timeline, as police clashed overnight with protesters at Denver and Salt Lake City encampments. In San Francisco, two officers were injured in scuffles with marching Occupy San Francisco demonstrators. One protester slashed an officer’s hand with a razor-like weapon and another tore an officer’s uniform and cut his cheek, police said.

Oakland police also released a news advisory warning media to tread carefully on covering the activities, citing a recent scuffle between a cameraman and camper and anarchist posts targeting press.

On Friday, the police union issued a statement asking the campers to leave immediately, while many city council members and merchants have said the camps need to end because they are hurting business.

The warning notices say campers do not have permission to lodge overnight and they must remove all tents, sleeping bags, tarps, cooking facilities and equipment and any other lodging material immediately or be subject to arrest.

With the pressure building, Don Link of Oakland has been offering his help to campers.

“What we are trying to figure out is if people want to leave Ogawa Plaza where they can go that they won’t get evicted,” said Link, who wants to use his truck to move campers. “A number of the people who don’t want anything to do with the violence have already gone to Snow Park. I’d be quite happy to help these people get to Snow Park. The last thing we want to see is more violence and people hurt.”

The city is trying to find shelter for those who want to leave the camp.

The Oakland Department of Human Services is offering homeless services outreach. On Friday night, three men left for City Team Shelter at 7th and Washington streets. All told, 21 men have moved to the shelter after voluntarily agreeing to leave the plaza, city officials said. The city’s winter shelter at the former Oakland Army Base is slated to open Tuesday.

“The city has come through with homeless outreach only on the occasions when our camp is under immediate threat of forcible removal,” Kae said. “They have offered single nights at shelters, which is an obvious public relations move to sweep the homeless out of the camp so that they do not end up hurting or gassing them, which would look bad in the press.”

About 200 campers left the plaza Saturday evening and marched in solidarity with Egypt.

Chanting “From Cairo to Oakland long live the revolution,” the group marched past the jail and police station while cops in riot gear guarded the entrances. There were no incidents.

Staff writers Matthias Gafni and Anda Chu contributed to this report.