An employee of Hilcorp Alaska drilling contractor, Kuukpik Drilling, was fatally injured at Milne Point on Alaska’s North Slope on Thursday night, Lori Nelson, manager of public affairs for Hilcorp Alaska, said in a statement.

“We are deeply saddened by this news and our thoughts and prayers are with their family and loved ones,” she said.

The cause of the incident is unknown at this time, but Hilcorp and Kuukpik are working with agencies to conduct a full investigation.

“The safety and protection of our personnel and community where we operate is our top priority,” Nelson said.

Drilling operations have been suspended where the incident took place.