According to Crimes and Criminal Procedure, Title 18 United States Code (USC) § 2332a, a<unk>  <unk>  is “any destructive device defined in § 921” (2006). These weapons include any explosive, incendiary, poison gas, bomb, grenade, rocket having a propellant charge of more than four ounces, missile having an explosive or incendiary charge of more than one-quarter ounce, mine, or device similar to the above. 
Children at increased risk to<unk> 
Increased respiratory rate (minute ventilation)
Heavier chemicals like SARIN will accumulate at a level where children are exposed to
Greater surface area to volume ratio
Small fluid reserves and higher metabolic rates
Dehydration
Increased toxicity from same exposure in an adult 
Increased respiratory rate (minute ventilation)
Heavier chemicals like SARIN will accumulate at a level where children are exposed to
Greater surface area to volume ratio
Small fluid reserves and higher metabolic rates
Dehydration
Increased toxicity from same exposure in an adult 
Dehydration
Increased toxicity from same exposure in an adult
Weapon of mass destruction
Radiation exposure 
Fishhook injury
Dirty bomb
Abscess
Bioterrorism
Masticator space infections
Chemical weapons