ANCHORAGE, Alaska (Reuters) - Two environmental groups on Tuesday filed a lawsuit seeking to overturn new federal regulations that grants permission to oil companies working in the Chukchi Sea to disturb the polar bears and walrus that live there.

The lawsuit, filed in U.S. District Court in Anchorage, challenges regulations issued last month by the U.S. Fish and Wildlife Service that allow "incidental takes" of the animals, meaning permission to disturb or accidentally harass them as long as such actions do not result in physical injury or death.

Tuesday's lawsuit, filed by the Center for Biological Diversity and Pacific Environment, is the latest volley in legal challenges over protections for polar bears and other animals from expanded oil development in the Chukchi and Beaufort Seas off Alaska.