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Occupy Austin members partipate in protests overnight Saturday. Some members of the group were arrested, police said.Police arrest more than 24 people in Portland, Oregon, after warnings that a park is closedPortland mayor: Authorities "worked really hard" to minimize confrontationPolice: A group that had set up a food table in Austin, Texas, was arrested after refusing to leaveScores of "Occupy" demonstrators have been arrested across the country(CNN) -- Dozens of Occupy protesters accused of trespassing were arrested in Oregon and Texas early Sunday, authorities said.
Police arrested more than two dozen people who refused to leave a park in northwest Portland, Oregon, after warnings that the park closed at midnight, police said.
Authorities in Portland "gave protesters numerous opportunities to simply walk away or choose to be arrested," Mayor Sam Adams told CNN affiliate KPTV.
"This tonight was, I think, an unnecessary confrontation that we worked really hard to minimize," he said.
As police entered the park, an Occupy Portland Twitter post said, "This is what a police state looks like."
Police also arrested 38 people in Austin, Texas, who had set up a table with food and other items outside City Hall. When the group was asked to leave the area, the 38 refused and were arrested, police said.
The arrests came two days after the city of Austin issued rules saying food tables at the event must be put away between 10 p.m. and 6 a.m.
Demonstrators across the country are protesting corporate greed and corruption. Many say the nation's wealthiest 1% hold inordinate sway over the remaining 99% of the population.
Scores of protesters have been arrested nationwide during the weeks-long "Occupy" movement.
On Friday, police said 51 demonstrators in San Diego, California, were arrested for various charges, including encroachment, unlawful assembly, illegal lodging and/or some form of obstruction of officers.
Three others were arrested on similar charges in Tampa, Florida, according to a police statement.
In Atlanta, police arrested demonstrators at a downtown park overnight Tuesday. The arrests came after Mayor Kasim Reed said he sent ministers to the park "to see if we can find a way to resolve this amicably."
In Nashville, Tennessee, authorities arrested more than two dozen protesters overnight Saturday, after they again defied a curfew imposed by the state's governor.
Twenty-six people received citations for trespassing, while two others were cited for public intoxication, according to Tennessee public safety spokeswoman Dalya Qualls.
On Thursday, Oakland, California, Mayor Jean Quan apologized for authorities' confrontations with demonstrators, who were tear-gassed. The clashes led to the hospitalization of an Iraq war veteran.
Marine veteran Scott Olsen suffered a skull fracture Tuesday night after allegedly being struck by a tear gas canister in Oakland, according to witnesses.
Despite recent crackdowns against demonstrators nationwide, the loosely defined "Occupy" movement does not appear to be losing steam.
In New York, where the Occupy movement was born, activists braved snow, sleet and rain Saturday during an unusually early snowstorm in the Northeast.
CNN's Susan Candiotti and Kara Devlin contributed to this report.
