Greenpeace erected another polar bear protest in Washington on Wednesday -- but this time the environmental organization sent out a warning.

Wednesday's bear was placed in front of the Capitol's reflecting pool, catching the attention of some tourists.

"We just happened to be walking by and it caught our eye," said Daryl Buford.

The six-foot bear held a sign reading, "Need More Ice, No More Oil."

U.S. Park Police officers showed up shortly after it was placed there, and began to move the bear before declaring it a First Amendment issue. Police said the display could remain there, so long as someone was minding it.

"This campaign isn't really about attracting a lot publicity it's about putting something out that can be surprised by," said Greenpeace's Carroll Muffett.

In a Wednesday news release, Greenpeace took credit -- or perhaps the blame? -- for Tuesday's stuffed polar bear sighting in Columbia Heights, which shut down the neighborhood, and the Metro station, for nearly two hours.

D.C. police considered the costumed bear suspicious, and called in the bomb squad. Officers cordoned off the area and evacuated nearby buildings, including businesses. The bomb squad tore the 'scuplture' apart, to make sure it wasn't dangerous.

"It broke out hearts to see the story go that way, and to see that reaction," said Muffet.

Police said Tuesday that the display would only be considered a crime if the organization planned for it shut down the area.

Previous 'Displays'

Greenpeace says Wednesday's polar bear was the fifth installment in its anti-global warming campaign, done in collaboration with street artist Mark Jenkins. The group uses the polar bear because its blames global warming for shrinking the animal's icy habitat.