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The GSF Grand Banks rig near Marystown in an archival photograph. (CBC)

Sources confirmed on Sunday that a semi-submersible drilling rig was adrift off the Newfoundland coast earlier this week.

According to online reports, the GSF Grand Banks was adrift for almost two days this week after a towline parted unexpectedly.

Sources said the line snapped on Wednesday during rough weather, while sea swells battered the coast of Newfoundland.

The line was not re-established until sometime on Friday, with assistance from the vessel Atlantic Hawk.