<Tr> <Td> September 20, 1916 </Td> <Td> Bemidji, Minnesota </Td> <Td> 0 </Td> <Td> </Td> <Td> Olga Dahl, the 19 - year - old teacher at the Round Lake District School, was found tied to a tree near the school, assaulted and shot twice in the face . She had been working late after school, and a man with a revolver entered the school house and ordered her to obey him . He raped and shot her; she was expected to live . All available men in Itasca County joined in hunting the assailant . </Td> </Tr> <Tr> <Td> December 26, 1916 </Td> <Td> Danville, Kentucky </Td> <Td> </Td> <Td>? </Td> <Td> During the Christmas tree celebration at the Harris Creek School, with a packed room of children and visitors, a fight broke out . William Benedict, Sr. was instantly killed, William Benedict, Jr. was shot in the ankle, Bourdon Galloway was shot in the right arm, and Mike Gaddis was shot in the leg . Many others were injured . The disturbance was said to be started by Thomas Thornton, who had been drinking and was told to calm down by Benedict . Thornton's brother George left the room and returned with a revolver . </Td> </Tr> <Tr> <Td> June 5, 1917 </Td> <Td> Harrisburg, Pennsylvania </Td> <Td> 0 </Td> <Td> </Td> <Td> 16 - year - old freshman Earl Wolf was accidentally shot in the leg with a revolver around noon time, in the company of his classmates at the Central High School . </Td> </Tr> <Tr> <Td> October 28, 1917 </Td> <Td> Chicago, Illinois </Td> <Td> </Td> <Td> 0 </Td> <Td> Overnight two brothers, 16 - year - old William and 15 - year - old Ralph Carter, broke into the May public school, robbing the phone boxes and teachers' desks . Discovered by janitor Howard Parks and policeman Thomas Conway, a gunfight broke out . William was critically wounded and not expected to live; Ralph Carter was taken to jail . </Td> </Tr>

How many school shooting in us since 2009