JUNEAU, Alaska — Conservation groups and an Iñupiat-aligned group sued Thursday to overturn the recent approval of an exploratory drilling program in the National Petroleum Reserve-Alaska, saying it was improperly analyzed by the federal government and could harm caribou and important habitat areas.

The U.S. Bureau of Land Management approved a one-year program proposed by ConocoPhillips Alaska last month that included seismic surveys aimed at helping identify oil and gas reserves and plans to drill four exploration wells. Activities would occur near existing ConocoPhillips Alaska developments, including the large Willow oil project, the lawsuit states.

The complaint, filed by Earthjustice on behalf of Sovereign Iñupiat for a Living Arctic, the Center for Biological Diversity and The Wil

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