This undated combination of photos shows a young man, left, who boarded an Air Canada flight in Hong Kong while elaborately disguised as an elderly male, center and right, the disguise he was wearing while on board the flight bound for Canada.

Halifax, Nova Scotia ? A young Asian man who boarded an Air Canada flight in Hong Kong elaborately disguised as an elderly white male is seeking refugee status in Canada in what border officials are calling an “unbelievable case of concealment.”

An internal intelligence alert from the Canadian Border Service shows before-and-after photos, and describes how the man boarded the flight in Hong Kong on Oct. 29 wearing a remarkable silicone mask to make him look like an elderly man.

A Canadian government official gave the alert to The Associated Press. The official provided the document Friday on condition of anonymity as the official was not authorized to release it publicly.

The passenger was seen at the start of the flight as an “elderly Caucasian male who appeared to have young looking hands,” the CBSA bulletin said. Later in the flight, however, “the subject attended the washroom and emerged an Asian looking male that appeared to be in his early 20s.”

The document says the man had a bag that contained a “disguise kit which consisted of a silicone type head and neck mask of an elderly Caucasian male, a brown leather cap, glasses and a thin brown cardigan.”

The bulletin, which carried the headline “Unbelievable Case of Concealment,” said information was received by Air Canada Corporate security regarding a possible impostor.

It said the man later admitted to officials that he had boarded the flight with the mask on and had removed it several hours later. It says they believe the man and another man performed a boarding pass swap. The government official said a U.S. passport was also involved.

Chris McCluskey, a spokesman for Public Safety Minister Vic Toews, said a man is in detention and said the matter is before Canada’s Immigration and Refugee Board.