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The Fort Lauderdale-Hollywood International Airport shooter pulled a gun out of a checked bag, loaded it in a bathroom and started shooting, killing five people and wounding at least eight, according to investigators. But how did he have access to his gun inside the airport? Under current Transportation Safety Administration rules, it is legal to have a weapon in checked luggage on board a plane. Weapons are not permitted in carry-on bags. Here are the TSA's rules for transporting firearms and ammunition: Firearms: When traveling, passengers must comply with the laws concerning possession of firearms as laws vary by local, state and international governments.Passengers must declare each firearm each time it's presented for transport as checked baggage. Ask your airline about limitations or fees that may apply.Firearms must be unloaded and locked in a hard-sided container and transported as checked baggage only. Only the passenger should retain the key or combination to the lock.Firearm parts, including magazines, clips, bolts and firing pins, are prohibited in carry-on baggage, but may be transported in checked baggage.Replica firearms, including firearm replicas that are toys, may be transported in checked baggage only.Rifle scopes are permitted in carry-on and checked baggage. Ammunition: Ammunition is prohibited in carry-on baggage, but may be transported in checked baggage.Firearm magazines and ammunition clips, whether loaded or empty, must be securely boxed or included within a hard-sided case containing an unloaded firearm. Small arms ammunition, including ammunition not exceeding .75 caliber and shotgun shells of any gauge, may be carried in the same hard-sided case as the firearm. Read TSA's full rules concerning weapons here.