CNN) -- A Minnesota Indian reservation is trying to overcome "shock and disbelief" as it looks for reasons why a high school student went on a shooting rampage Monday, killing nine people and wounding as many as 13 others before killing himself.<br /><br />Police said the student killed two of his grandparents, then went to his high school, killing seven people there.<br /><br />FBI Special Agent Paul McCabe said the dead include a female teacher, a male security officer and four students at Red Lake High School. <br /><br />"We believe that one of those students is the shooter," McCabe said Monday.<br /><br />The FBI office in Minneapolis, Minnesota, later said two more wounded students had died. <br /><br />Floyd Jourdain, chairman of the Red Lake Ojibwa Nation, said he "knew practically all the people involved" in the shootings on the Red Lake Indian Reservation in northern Minnesota. The community is dealing with "shock and disbelief," he said.<br /><br />"This is a small community," he said. "There will not be one soul who isn't touched by this tragedy here in Red Lake."<br /><br />"It still hasn't sunk in," he said. <br /><br />Jourdain would not comment further on the case, saying the FBI had scheduled an 11 a.m. ET news conference.<br /><br />McCabe said Monday that the FBI thought the shooter was acting alone.<br /><br />The slain students were shot in one room of the school, he said.<br /><br />"Apparently, he walked down the hallway shooting and then he entered a classroom, he shot several students and a teacher, then himself," said Roman Stately, with the Red Lake Fire Department, who arrived at the high school moments after the shootings Monday.<br /><br />Authorities discovered about an hour later that the boy had shot and killed his grandmother and grandfather, a veteran of the police force, Stately told KARE-TV.<br /><br />Stately said the boy used his grandfather's police-issued weapon in the school rampage.<br /><br />Witness Sondra Hegstrom described the gunman grinning and waving, according to The Pioneer of nearby Bemidji, Minnesota. <br /><br />"I looked him in the eye and ran in the room, and that's when I hid," she told the newspaper.<br /><br />Teacher Diane Schwanz told The Pioneer that the shooter tried to break through the door to her classroom. <br /><br />"I just got on the floor and called the cops," Schwanz told the paper. "I was still just half-believing it." <br /><br />The shootings occurred about 3 p.m. (4 p.m. ET) in Red Lake High, a school of 300 students that is on a sovereign Indian reservation near the Canadian border about 240 miles north of the Twin Cities.<br /><br />Tribal authorities closed the reservation after the shootings, The Associated Press reported.<br /><br />Minnesota Gov. Tim Pawlenty expressed his condolences.<br /><br />"We ask Minnesotans to help comfort the families and friends of the victims who are suffering unimaginable pain by extending prayers and expressions of support," his office said in a statement.
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