Celebrity Cruises says it’s cancelling the remainder of a seven-night cruise to Alaska after mechanical issues forced a ship carrying more than 3,100 passengers and crew members to return to port in Ketchikan.

Four additional sailings scheduled to take place on the same ship also have been canceled.

A cruise line spokeswoman said late Tuesday by email that the repairs needed on the Celebrity Millennium have forced the cancellation of sailings scheduled for Aug. 23, Aug. 30, Sept. 6 and Sept. 13.

Spokeswoman Cynthia Martinez says guests booked on a canceled sailing will receive a full refund, as well as a certificate for a future cruise.

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Photo Credit: This Sunday, Aug. 19, 2013 photo shows a small crowd as it gathers near Berth 3 to watch the Celebrity Cruises Millennium return to Ketchikan, Alaska. Alex Bosworth / AP Photo/Ketchikan Daily News