GREENPEACE has announced its executive director will travel to Peru to personally apologise for the environmental group's stunt at the world-famous Nazca lines, which Peruvian authorities say harmed the archaeological marvel.
The group added it was willing to accept the consequences.
A senior Peruvian official said his government would seek criminal charges against Greenpeace activists who allegedly damaged the lines by leaving footprints in the adjacent desert.
Greenpeace said in a statement: "We fully understand that this looks bad. We came across as careless and crass."
Greenpeace regularly riles governments and corporations it deems environmental vandals. Monday's action was intended to promote clean energy to delegates from 190 countries at the UN climate talks in nearby Lima.
But the group signalled yesterday that it recognised it had deeply offended many Peruvians.
It added Greenpeace's executive director, Kumi Naidoo, would travel to Lima this week to apologise. Greenpeace will fully co-operate with any investigation and is "willing to face fair and reasonable consequences", the statement said.
The Nazca lines are huge figures depicting living creatures, stylised plants and imaginary figures scratched on the surface of the ground between 1,500 and 2,000 years ago. They are believed to have had ritual astronomical functions.
In the stunt at the UN World Heritage site in Peru's coastal desert, activists laid a message promoting clean energy beside the famed figure of a hummingbird comprised of black rocks on a white background.
Deputy culture minister Luis Jaime Castillo called it a "slap in the face at everything Peruvians consider sacred".
He said the government would seek to prevent those responsible from leaving the country and ask prosecutors to file charges of "attacking archaeological monuments", a crime punishable by up to six years in prison.
The activists entered a "strictly prohibited" area where they laid big yellow cloth letters reading: "Time for Change; The Future is Renewable". They said after initial criticism that they were "absolutely careful" not to disturb anything.
Mr Castillo said no-one, not even presidents, is allowed without authorisation where the activists trod, and those who do have permission must wear special shoes.
The Greenpeace delegation chief to the climate talks, Martin Kaiser, said none of the people involved in the action had been arrested.
"I think activists are always taking responsibility for what they are doing," he said. "We clearly underestimated the sensitivity of the situation."
He would not say whether any activists face internal sanction for the action.
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