The banner showed President Obama’s face — Greenpeace said it was an unfinished portrait, implying that Obama’s legacy was in question — and the words “America honors leaders not politicians: Stop Global Warming.”

A trio of climbers unfurled it about 12:30 p.m. Eastern time, over a rock face next to the image of Abraham Lincoln on the far right side of the South Dakota landmark.

Less than two hours later, a Greenpeace spokesman said, all three, plus eight other Greenpeace activists at the site, had been taken into custody by park authorities.

Patty Rooney, a spokeswoman for the National Park Service, confirmed that there had been arrests. Rooney said prosecutors had not yet decided what charges the activists would face.

Rooney said that Park Service workers had not been able to take down the banner or assess any damage to the 67-year-old monument because high winds were making those tasks difficult. She said that the first task for park workers would be “getting our people safely up there and getting them [the Greenpeace activists] safely down.”

The demonstration at Mount Rushmore was one of several staged today by Greenpeace seeking to influence world leaders at the Group of Eight summit in L’Aquila, Italy.

That meeting, along with another tomorrow that will include a wider circle of economic powerhouse nations, is supposed to help create a global strategy for reducing greenhouse gas emissions. But disagreements over how deeply to cut — and how many cuts there should be — have held up progress.

Also today, Greenpeace said its activists were holding demonstrations in Italy at four coal-fired power plants, a kind that produces particularly high emissions. Images on Greenpeace’s web site showed a demonstrator apparently using rock-climbing gear to hang off machinery at a plant near Venice, with a banner reading “Green Jobs.”

At Mount Rushmore, Greenpeace spokesman Michael Crocker said the activists had hiked to a ridge just above the six-story-tall heads. Then, he said, three of them rappelled over the side with the banner, two of them spending time suspended on Lincoln’s forehead.

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