Occupy Portland demonstrators set up tents in the park earlier in the day and vowed to stay through the winter, defying city officials who said overnight camping will not be allowed.

Police Sgt. Pete Simpson says officers began detaining protesters around 8:30 p.m., after the park was closed a half hour early.

He says several arrests were made but still doesn’t have an exact count.

The Portland protesters had been without an encampment since police swept through a downtown site three weeks ago.