U.S. customs officials have released a photo of a mock improvised explosive device that led to delays at Toronto’s Pearson International Airport when it was found in a passenger’s luggage earlier this month.

United States Customs and Border Protection tweeted the photo Monday morning and praised the officers who spotted the device on April 6.

Read more:U.S. man arrested as fake bomb stalls Chicago-bound flight at Pearson

The discovery of the item during an inspection at the airport’s pre-clearance area caused what was described as a major security breach.

Passengers on a United Airlines flight to Chicago were stuck on the tarmac for more than four hours before they could disembark.

An American man — 58-year-old Joseph Galaska — was charged with one count of mischief in connection with the incident.

He was released on bail and his case is due back in a Toronto-area court on Tuesday, though his lawyer says he will not appear in person.

Galaska’s wife has told ABC News the device found was an alarm clock.