Authorities have launched a search for a 72-year-old man believed to have gone overboard from a Princess Cruise ship ahead of its Monday arrival in San Francisco.

A passenger travelling on the Ruby Princess ship disappeared and was nowhere to be seen when the vessel returned to the US, with officials ruling it as a man overboard incident

Princess Cruises officials believe a 72-year-old man went overboard on Monday before the Ruby Princess cruise docked in San Francisco. “Princess Cruises is saddened to report that a 72-year-old American male is believed to have gone overboard earlier today ahead of the arrival of Ruby Princess into San Francisco,

An elderly male passenger is now reported missing from Ruby Princess but the exact location of the incident is unknown.

A 72-year-old man likely went overboard from a Princess Cruises ship before it docked in San Francisco this morning. The Ruby Princess arrived in port at 6:50 a.m., Princess said in a statement to SFGATE.

The man's disappearance is under investigation by U.S. Customs and Border Protection, company officials said Monday.

A passenger on the Ruby Princess is believed to have gone overboard ahead of the cruise ship’s arrival Monday in San Francisco, according to officials. In a statement, Princess Cruises said the 72-year-old man was not found following an extensive review of closed-circuit television footage and several searches of the vessel.