A Scottish oil company was forced to suspend operations on an offshore oil rig near Greenland Saturday after 18 activists climbed aboard the rig.

The activists from the group Greenpeace said they want to force Cairn Energy to publish its oil spill response plan.

The activists say Arctic oil drilling is dangerous because the freezing temperatures and remote location would make it difficult to contain an oil spill.

Earlier this week, police arrested two Greenpeace activists on the same rig, the Leiv Eiriksson, because they had attached themselves to the rig in a plastic pod. Their actions forced a four-day delay to the start of the drilling.

Cairn recently won permission from Greenland to expand its drilling project in the region from three wells to seven. Last month it announced plans to drill four wells this year at a cost of $600 million.

The company says it has filed a legal action against Greenpeace in the Netherlands, asking for compensation of nearly $3 million for every day it must suspend operations due to Greenpeace actions.