Massacre Motive Unknown

Authorities are trying to determine what caused a 16-year-old to gun down his grandfather, put on the man's police-issue belt and bulletproof vest, and drive his marked squad car to a high school, where he began shooting his classmates at will.

Jeff Weise killed nine people and wounded seven Monday before trading gunfire with a police officer and apparently shooting himself. His motive is still unknown, but the FBI says the shootings appear to have been planned in advance.

It is the United States' worst school shooting since the Columbine massacre in April 1999 that ended with the deaths of 12 students, a teacher and the two teen gunmen.

The killings on this northern Minnesota Indian reservation began at the home of Weise's grandfather, Daryl Lussier, 58, who was shot to death with a .22-caliber gun, according to Michael Tabman, the FBI's special agent in charge for Minneapolis. Also killed was Lussier's 32-year-old companion, Michelle Sigana.

Lussier had worked as a tribal police officer for decades. Weise then drove the older man's squad car to the high school, where he gunned down security guard Derrick Brun at the door and spent about 10 minutes inside, targeting people at random.

Hearing the shots, students and adults barricaded themselves into offices and classrooms and crouched under desks, authorities said. Five students were shot to death and two 15-year-olds remained in critical condition at a Fargo, N.D., hospital with gunshot wounds to the face.

Authorities say the manner with which Weise apparently carried out the shootings might indicate they were premeditated and intentional.

CBS News Correspondent Bob McNamara reports that with nearly a dozen students wounded, emergency room staffers were stunned by the shooter's apparent vengeance on his victims.

"It takes you back a step, what he was targeting," emergency room worker Tim Hall told McNamara. "Looks like they were shooting at people's heads. That's a little scary."

"Right now we are in utter disbelief and shock," said Floyd Jourdain Jr., chairman of the Red Lake Band of Chippewa.

According to McNamara, the Red Lake reservation is a bleak and financially troubled area. The school district produces some of Minnesota's lowest test scores, which is unusual for such a small school and close-knit population.

"Without a doubt this is the darkest day in the history of our tribe," Jourdain Jr. said.

Red Lake High School has about 300 students, according to its Web site.

Authorities are investigating whether Weise, who dressed in black - frequently a trench coat - and wrote stories about zombies, may have posted messages on a neo-Nazi Web site expressing admiration for Adolf Hitler.

Using the handle "Todesengel" — German for "Angel of Death" — the writer identified himself as Jeff Weise of the Red Lake Reservation. In April 2004, he referenced being accused of "a threat on the school I attend," though it says he was later cleared.

Tabman said Tuesday he couldn't confirm whether Weise was the person who made the postings.

School board member Kathryn Beaulieu said Weise had been placed in the school's Homebound program for a policy violation. She did not elaborate.

Relatives told the St. Paul Pioneer Press that Weise was often teased by others. They said his father committed suicide four years ago and his mother is living in a Minneapolis nursing home because of brain injuries suffered in a car accident.

Residents at the home where Weise was believed to have lived with his grandmother declined to comment Tuesday. School was canceled for the day as investigators scoured the building for clues.

At the State Capitol building in St. Paul, several hundred people attended a prayer ceremony for victims of the shooting where religious leaders joined Indians in drumming and chanting.

"Once again our people have been hit ... but our people are strong," said Ona Kingbird, a Red Lake tribal member. "We'll come out of it."

Minnesota Gov. Tim Pawlenty expressed his condolences for the families of the victims and said it appeared the school had "very rigorous security."

"It looks like you had a very disturbed individual who was able to overcome a lot of precautions to do a lot of damage," the governor said.

But a school secretary and a cousin of the slain security guard said that Brun and a female security guard who fled from Weise did not carry guns. Brun's cousin, Nancy Richards, said Brun also did not wear a bulletproof vest.

It was the second fatal school shooting in Minnesota in 18 months. Two students were killed at Rocori High School in Cold Spring in September 2003. Student John Jason McLaughlin, who was 15 at the time, awaits trial in the case.

CBS News Correspondent Mika Brzezinski spoke with Dr. William Pollack of Harvard Medical School to talk about whether warning signs can be used to predict when deviant behavior can become deadly.

"If we said the typical school shooter was an adolescent who wore black, was a male, listened to weird music, and got upset all the time, that would be 90 percent of all male adolescents," Pollack said. "It's just not useful."

He said that while a clear stereotype of a school shooter does not, and cannot, exist, there are ways to recognize when a teenager is becoming a threat.

"If more people around America understood these key warning signals and helped the boys and girls who show them, we'd not only prevent shootings, we'd prevent suicides, we'd diminish depression, we'd enhance mental health of adolescents in the United States," Pollack told Brzezinski.

The reservation is about 240 miles northwest of Minneapolis. It is home to the Red Lake Chippewa Tribe, one of the poorest in the state. According to the 2000 census, 5,162 people live on the reservation.