( CNN ) -- A 37-year-old airline passenger was arrested Tuesday in Miami after primer caps for bullets ignited while a baggage handler was unloading a roll-on bag , the FBI said . The tarmac incident is not believed to be terrorism-related , FBI special agent Michael Leverock said . Leverock would not provide details or speculate on how the bag might have gotten on the plane . He compared the primer to a `` spark plug '' for the bullet . The unidentified passenger , a naturalized U.S. citizen who was bound for Jamaica , was charged with transportation of hazardous materials . If convicted , he could face a sentence of up to five years . The flight from Boston landed at Miami International Airport around 11:30 a.m. , American Airlines said . The 737 had two pilots , four flight attendants and 148 passengers . Hundreds of the primer caps were in a bag that ignited , and all of them went off after the first one did , Leverock said . Several hit the baggage handler 's shoes , but he was not injured . The bomb squad was among those who rushed to the scene . The incident caused four other flights to be delayed , the airport said . Leverock said part of a shirt inside the bag was charred , but the movement of the bag is what set off the explosion . CNN 's Sara Pratley contributed to this report .
Man arrested after bag ignites on Miami tarmac . Hundreds of bullet primer caps were packed together . Score: 6