WASHINGTON, March 2 — A man was arrested and charged with attempting to place an explosive or incendiary device on an aircraft after his bag triggered an alarm at Lehigh Valley International Airport in Pennsylvania, US authorities said yesterday.

The FBI said that Mark Muffley, 40, from Lansford, Pennsylvania, checked a suitcase on Monday for a flight that was heading to Sanford, Florida.

The bag triggered an alarm and officials found what they described as a "circular compound” hidden in the lining of the baggage, with two fuses and powder concealed in wax paper and plastic wrap, the FBI said in its formal complaint.

The "powder is suspected to be a mixture of flash powder and the dark granulars that are used in commercial grade fireworks,” the complaint added.

"The black powder and flash powder are susceptible to ignite from heat and friction and posed a significant risk to the aircraft and passengers.”

After the alarm went off, authorities paged Muffley to report to security at the airport. Minutes later, Muffley was seen leaving the airport, the FBI added. Later that evening, he was arrested at his home.

Further details on the incident, including Muffley’s alleged intent, were not immediately known. Reuters could not immediately contact Muffley or a representative.

ABC News reported Muffley was due in court on Thursday.

The airport said it had closed a part of its main terminal briefly on Monday while authorities probed the suspicious package. — Reuters