at the elementary school in Connecticut, 28 people died altogether, 20 of them were children, the others were adults. the shooter walked into his mother's classroom (yes, the man's mom was a teacher at the school) and fired away. He killed a whole kindergarten class. excerpt from an article online: "The 20-year-old killer, carrying two handguns, committed suicide at the school, and another person was found dead at a second scene, bringing the toll to 28, authorities said."
There was 27 people killed, not counting the shooter, 20 children, 6 staff members, and the shooter's mom was found killed in her house... Which his mother was the teacher of one of the classes Adam Lanza took out.