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Retired NYPD Detective Pat Brosnan said terrorists are likely watching Sunday's massive power outage at the busiest airport in the world as a "blueprint for destruction."

Brosnan said people should remain alert in the wake of the complete outage at Hartsfield-Jackson International Airport in Georgia, even though it was not terror-related.

"They're studying us like a frog under the glass," Brosnan said, "they're assessing vulnerabilities at all times."

He said that, after the casualties from truck attacks in Paris, London and the one on Halloween near Battery Park City in New York, terrorist now understand how to use a vehicle as a weapon.

"They're studying us, Neil," he said on "Your World with Neil Cavuto."

Brosnan said law enforcement officials like himself are continuing to "harden their defenses" and evolve as terrorists' methods evolve.

He called the apparently accidental outage in Atlanta "a blueprint for destruction," noting the "pandemonium" and disorganization that ensued after the terminals went dark.

Brosnan said it reminded him of an incident at John F. Kennedy International Airport in Queens, N.Y., where reports of a shot being fired in a terminal caused chaos until it was determined to be a false alarm.

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