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. Last Updated: 07/27/2016

Shooter in U.S. School Kills 9, Self

REDBY, Minnesota -- A heavily armed teen accused of killing his grandparents later smiled and waved during a rampage at a high school as he gunned down seven more people, brushing off pleas to stop and asking one of his victims whether he believed in God.

Reggie Graves, a student at Red Lake High School, said he was in class Monday when he heard the gunman blast his way past the metal detector at the school's entrance, killing a guard. Then, in a nearby classroom, he heard the gunman speak to his friend Ryan. "He asked Ryan if he believed in God," Graves said. "And then he shot him."

The rampage at Red Lake Indian Reservation in far northern Minnesota was the nation's worst school shooting since the Columbine High School massacre in 1999 that left 13 people dead.

When the rampage was over, 10 people were dead, including the gunman's grandfather, a woman who may have been his grandfather's wife or girlfriend, a school security guard, a teacher and five other students. At least 14 others were wounded, officials said.

Police said the gunman killed himself after exchanging fire with officers.

Officials did not identify the shooter, but several students said he was Jeff Weise, a teen who may or may not have been a student at the school.

Relatives said that his father committed suicide four years ago, and that his mother was living in a Minneapolis nursing home because she suffered brain injuries in a car accident.