BOSTON (CBS) – Occupy Boston protesters clashed with police Thursday night, leading to one arrest.

Demonstrators said the standoff was over their attempt to bring an industrial-sized kitchen sink to their encampment for hygiene purposes.

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Officers confiscated the sink, which escalated tensions.

Police said 75-to-100 protesters surrounded a police patrol wagon after 8:30 p.m. and refused to let it move.

One person, 26-year-old Gary Williams of Quincy, was arrested on charges of assault and battery on a public employee.

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The city has banned the protesters from bringing anything to the encampment to make it a permanent residence.

The sink wasn’t the only issue.

Winterized tents are also not allowed in the camp, but there’s one in there. The big, green military-style tent is used to store food. It was put up more than a week ago.

Police are trying to find out how it was brought in. Officers are supposed to be stopping protesters from bringing winterization supplies into the camp.

Thursday’s events came as a judge considers whether to give the city the right to evict protesters from Dewey Square. They have been there for more than two months.

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A ruling is expected by December 15.