ANCHORAGE, Alaska—Responders say a main tow line has been attached to a Shell oil-drilling ship that grounded on rocks near a remote Alaska island.

Unified Command spokesman Ignacio Gonzalez says Royal Dutch Shell's Kulluk was attached to the towing vessel Aiviq on Sunday.

The command center says an attempt to tow the drilling ship off Sitkalidak Island would come Monday though it could come sooner, weather permitting. Crews want to tow the ship 30 miles to shelter in Kodiak Island's Kiliuda Bay.

Responders say there's no sign the hull of the Kulluk has been breached or that oil has spilled from the vessel.