ANCHORAGE, Alaska (AP) — Moving ice may keep a Royal Dutch Shell petroleum drill ship away from a Chukchi Sea prospect for several days, a Shell Alaska spokesman said Tuesday.

Curtis Smith said at midday that a massive ice pack heading toward the Burger Prospect had slowed from 0.5 knots to 0.2 knots — about 1/4 of a mile per hour — and remained 10 to 12 hours away.