BOSTON—The U.S. Transportation Security Administration said Tuesday it has moved to fire six screeners at Boston's Logan International Airport who performed inadequate luggage checks because they were distracted by their cellphones or other devices.

The agency said 14 others face suspension for inattention to duty.

A routine audit that showed some officers were not paying close attention to monitors that display the contents of each bag passing through an explosives-detection machine. Others ignored protocols to hand-inspect bags that triggered alarms.

The TSA told The Boston Globe that no dangerous materials got through the detection system.

“All TSA employees are held to the highest standards of conduct and accountability,” the agency said in a statement. “These standards are critical to our work and TSA's commitment to the safety of the travelling public.”

The lapses were discovered during a routine audit in which managers reviewed closed-circuit television video to see when alarms were triggered and how workers handled the events.

All 20 employees facing dismissal or suspension, including two managers and a supervisor, worked in the same baggage room.