A Cathay Pacific employee has been arrested for allegedly taking upskirt photos of a female colleague at the airline's headquarters in Chek Lap Kok.

The victim called the police on Monday after someone snapped pictures of her with a mobile phone in an office in the South Tower of Cathay City on Scenic Road.

The suspect, 39, an American in a managerial position, was later arrested for accessing a computer with criminal or dishonest intent.

He was released on a bail and must report back next month.

The case is being investigated by an airport district investigation team.

A police source said the suspect had twice taken upskirt pictures of the victim, a flight attendant now working on the ground due to pregnancy. She was immediately alerted about the man's act and called police after a discussion with her family.

Investigators found a picture of the victim in the suspect's mobile phone. They have yet to determine if there were other victims.

A Cathay Pacific spokesman said it was aware of an alleged case of sexual harassment.

He said: "We do not tolerate any form of harassment and take this issue very seriously. An urgent internal inquiry has been launched, and we supported the staff concerned to report the matter to the police."

The company said it would provide support and assistance to the staff concerned.