Denver airport security missed trespasser who was killed by plane on runway

FORT COLLINS, Colo. — Workers at Denver airport initially missed a security breach by a man who scaled an 8-foot perimeter fence and crossed a runway, where he was hit and killed in a fiery collision by a plane with 231 people on board, authorities said Tuesday.

The runway fatality underscores the longstanding challenge of keeping intruders out of major airports. Denver International Airport sprawls across 53 square miles — twice the size of Manhattan — on open prairie northeast of the city center.

The 41-year-old trespasser triggered an alarm as he crossed into the airport in a remote area about 2 miles from the terminal late Friday night. But security personnel mistakenly attributed the alarm to a nearby herd of deer.

Authorities said the man died by suicide. However, no note from the victim was immediately recovered. The manner of death was determined based on the investigation at the scene, a records review and a postmortem examination, said Sterling McLaren, chief medical examiner for the city and county of Denver.

The collision involving the Frontier Airlines plane as it was taking off for Los Angeles sparked an engine fire that forced passengers to evacuate via slides. Twelve people sustained minor injuries and five were taken to hospitals. Four have since been released, said airport Chief Executive Officer Phillip Washington.

A black-and-white video released by the airport shows, from a distance, a figure walking toward the runway with arms swaying. The person crosses onto the runway at a slight angle, and seconds later, the plane is seen speeding past. It strikes the person with its right engine, which bursts into flame.

A few minutes before the man scaled the fence, a ground-based radar system activated in the area, triggering an alarm. An airport worker checked a surveillance camera and saw a herd of deer in the same area, but did not initially see the trespasser, Washington said.

"The camera view was alternating between the wildlife and the individual. There are some ditches in the area, so the person was out of view for a bit as well," Washington said.

He said federal officials notified the airport about the trespasser. Because of the remote location and short time period between the man scaling the fence and crossing the runway, Washington said airport personnel were not able to intervene.

The man crossed about 650 feet from the fence to the runway before being struck and killed by the Frontier Airlines plane traveling at 150 mph on takeoff.

The plane's engine caused the man's death, McLaren said. She described it as "a purposeful act with a foreseeable fatal outcome."

Denver Police Chief Ron Thomas said investigators were contacting the man's family and those who knew him to seek more information about his motivations.

Trespassers breaching airport perimeters is a regular problem, with perhaps dozens annually nationwide, said security expert Jeff Price, who was assistant director of security at the Denver airport in the 1990s. The airport is surrounded by about 36 miles of perimeter fence, which airport officials say is continuously inspected.

The vast majority of airport trespassers are intoxicated or simply "messing around just to see if they could do it," said Price, adding that they typically don't pose a real threat. Denver also gets the rare individual who will jump the fence seeking to prove a long-running conspiracy theory about a UFO base being based at the airport, he said.

The Transportation Security Administration oversees airport security programs, including perimeter security requirements.

"It's really not that difficult to jump an airport perimeter fence," Price said. "They meet the standards for TSA, but the standards are not that robust."

The fences are typically 6 to 8 feet tall with barbed wire at the top, he said. They must be approved by federal inspectors, but there are no set rules on their construction. Major airports such as Denver typically also have intrusion detection systems that include cameras and motion sensors, he said. Some systems detect the seismic impact of people dropping to the ground, Price said.

The person was killed on the airport's easternmost north-south runway and at least 1.25 miles from any airport buildings. Empty fields and croplands surround Denver International Airport in most directions. Distant trees and structures in the video showed that the person was headed toward the airport when they crossed the runway.

The Transportation Security Administration has regulatory oversight of airport security programs, including perimeter security requirements.

Separately, the National Transportation Safety Board on Sunday said it is gathering information about the evacuation.

An agency spokesperson said an investigation would be launched if it's determined the injuries meet the agency's definition for "serious." That can include a person requiring hospitalization for more than 48 hours, suffering a broken bone or second- or third-degree burns affecting more than 5% of their body.

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