US: A year ago schoolboy Jeff Weise wrote on a neo-Nazi website: "By the way, I'm being blamed for a threat on the school I attend because someone said they were going to shoot up the school on 4/20, Hitler's birthday.
"And just because I claim being a National Socialist, guess whom they've pinned," he went on.
On that occasion the native American youth was cleared as a suspect, but on Monday Weise turned up at his school on the Red Lake Indian reservation in Minnesota and shot it up with deadly consequences.
Firing at random, the 16-year-old killed five fellow students, a teacher and a security guard and wounded a dozen others before shooting himself.
It was the deadliest killing spree at a school in the United States since the 1999 killings at Columbine High School in Colorado, when two students killed 13 people and wounded 23 others.
Before going on his bloody rampage, Weise shot and killed his grandfather, a veteran tribal police officer, and his grandmother at their home.
He took his grandfather's .22 calibre gun and bullet-proof vest and drove his police car to the school. There he fired dozens of shots before fire was returned by a police officer and he went into a classroom and shot himself.
Student Sondra Hegstrom said she heard the killing from an adjacent classroom. "You could hear a girl saying, 'No, Jeff. Quit! Quit! Leave me alone. Why are you doing this?' Boom, boom, boom, and then no more screaming," she said.
Another student said the killer pointed his gun at a boy, changed his mind, smiled, waved and shot somebody else.
The shooting highlights the lethal mix of alienated teenagers, guns and hate groups that leads to such acts of domestic terrorism in American society.
The youth was clearly deeply troubled. His father committed suicide four years ago and his mother is in a nursing home with brain injuries from a car accident. He was on medication, a tribal elder said. At school he was a loner, subject to teasing because he dressed in "gothic" style, according to fellow students.
In March last year Weise found an outlet in the neo-Nazi Libertarian National Socialist Green Party (LNSGP) and contacted its website. He introduced himself as "Todesengel" (German for "angel of death"), though he later changed his name to "NativeNazi".
Weise said he wanted to join the party as "I guess I've always carried a natural admiration for Hitler and his ideals, and his courage to take on larger nations". Yesterday the website posted a defiant message from its news service in Austin, Texas, saying it refused to "wring hands" for the shooting which it blamed on "modern society".
It acknowledged the group knew Weise through 34 postings in the chat room and that he "expressed himself well and was clearly highly intelligent and contemplative, especially for one so young". He participated because, unlike "white nationalist" movements, the LNSGP "embraced all races as part of its vision of world nationalism".
However, the website is saturated with racial content and Nazi symbols, and the preceding news item is headed "Negro Practises Cannibalism in UK".
It has links to other sites such as Vanguard News Network with the slogan "No Jews, Just Right".
In a revealing comment, Weise complained that where he lived there were no full-blooded natives and "among the youth, wanting to be black has run rampant". Kids his age were killing each other because of the rap influence.
There were "wannabe-gangsters everywhere", and "I can't go five feet without hearing someone blasting some rap song over their speakers". It was hard, though, being pro-Nazi, he said, as "people are so misinformed, ignorant and closed-minded, it makes your life a living hell".
"This is without a doubt the darkest hour in the history of our tribe," said Floyd Jourdain, leader of the Red Lake Indian reservation which is home to about 5,000 mostly American Indians of the Chippewa tribe.
Police said that students and teachers hid inside classrooms and used their cell phones to alert police when the shooting started around 3pm.
"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 of the Red Lake fire department.
The Red Lake Net News identified the youth's grandfather as Daryl "Dash" Lussier. Police said they believed the killer acted alone. The school has registered 355 students.