NEW : Alaska EPA says the state is looking for signs of environmental damage . The offshore drilling barge currently shows no sign of leaking fuel , the Coast Guard says . A tug had to set the rig free during a severe storm Monday . The rig 's crew of four evacuated on Saturday .
NEW : Alaska official says the state is looking for signs of environmental damage . The grounded drilling barge Kulluk shows no sign of leaking fuel , the Coast Guard says . A tug had to set the rig free during a severe storm Monday . The rig 's crew of 18 evacuated on Saturday .