OTTAWA – An internal review says screeners at the Edmonton airport failed to identify, intercept and handle a pipe bomb in “the manner expected” by Canada’s air security authority.

The newly disclosed review says several personnel had feelings – with varying degrees of conviction – that the item might be a pipe bomb or some other kind of improvised explosive device.

However, because of a manager’s assessment that the item was simply drug paraphernalia, no one acted fully on the suspicions, and the police were not called until several days later.

The Canadian Air Transport Security Authority’s review of the September 2013 episode, completed last November, was obtained today by The Canadian Press under the Access to Information Act.

The review recommended improvements to training, search techniques, decision-making and clarity of employee roles.

Teenager Skylar Murphy, who had built the pipe bomb with a friend for their own amusement, inadvertently left the device in a camera bag and forgot about it.

Murphy pleaded guilty last December to possession of an explosive device. He was sentenced to one year probation, fined $100 and ordered to make an in-person donation of $500 to the University of Alberta Hospital’s burn unit.