LAST UPDATE—2:35 A.M. ON TUESDAY

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Boston Police moved in on a patch of the Rose Kennedy Greenway between Congress Street and Pearl Street at approximately 1:20 a.m. on Tuesday morning and began arresting activists participating in the "Occupy Boston" protests downtown. On Monday, the protesters faced an ultimatum by Mayor Tom Menino: return to your original occupation in Dewey Square, or face eviction by the police. Protestors had expanded to the second, new camp site between Congress and Pearl.

Protesters expected police action at midnight, but the bell tolled 12 without any stir. Eighty minutes later, however, Boston Police wearing protective vests and carrying helmets marched in from side streets and surrounded the new camp site, announcing that protesters had minutes to disperse or they would face arrest.

Approximately 18 Boston Police vehicles also pulled up alongside the camp site to transport arrestees. Tim Caputo, reporter for WHDH-TV, posted video of some of the first arrests.

By approximately 2:10 a.m., the camp site had been generally cleared of both protesters and tents.

A flyer distributed by Boston Police earlier in the evening at the camp site said that if "you are unlawfully assembling, or trespassing, you will not be allowed to remain in the area. Please immediately leave the area with your belongings, or you will be subject to arrest." The same flyer defined trespassing as "remaining upon land of another after having been forbidden to do so by a person who has lawful control over the premises." A video posted on YouTube (attached) showed a Boston Police officer saying through a bullhorn protesters would "be locked up for trespassing and unlawful. This is our last notice before we move in and clear the park." A woman yelled out asking, "What's unlawful assembly," and the officer said, "we gave out flyers." Other protesters on the video were saying that not everyone in the park could hear the officer.