Three students were stabbed Wednesday morning at a high school by an angry student who had a canister of propane when confronted by school administrators, school and police officials said. The student at Antietam Middle-Senior High School was taken into custody by police after school officials disarmed the boy. Students were evacuated. Principal James Snyder said he and a teacher were responding to a disturbance when they confronted the student, who held them at bay with the canister. A 16-year-old girl was taken to Reading Hospital with cuts to both hands, hospital spokesman William J. Rudolph Jr. said. Doctors also treated a 15-year-old girl with a small wound to her upper back and a 14-year-old boy with a small wound to his upper right arm, he said. All three were released, Rudolph said.