Two students were arrested and charged with bringing two stink bombs to the Tuba City (Ariz.) High School April 27. Fumes sent six people to the hospital. Rager G. Hudson and Stewart R. Tracy Jr., both 18, told investigators they wanted to create a few laughs and get out of school early, but had no intention of harming anyone, said an FBI spokesman. Both tribal members were charged April 28 in Navajo Tribal Court with aggravated battery, dangerous use of explosives, conspiracy and endangering the welfare of a minor. Each charge is a misdemeanor, punishable by up to a year in prison, said a spokeswoman for the U.S. Attorney's Office. They made the explosive devices by putting cleaning chemicals and aluminum foil in a plastic bottle, Hall said. Four students and two janitors were treated and released Thursday for minor eye and throat irritation after inhaling the substance used in the devices. The students admitted placing one explosive - which did not harm anyone - in the boy's bathroom. Hudson placed a second explosive in another bathroom. When nothing happened, he put it in his backpack. As he walked through the student-filled hallway, the chemical reaction began and he unzipped his backpack to remove the device. That's when some students were injured, including Hudson, who suffered minor burns. Classes were canceled Friday.