Thousands of students monitor a memorial service at the football stadium on the campus of Virginia Tech University in Blacksburg, Va., Tuesday, April 17, 2007. [AP]

The Chicago Tribune reported on its Web site that the note railed against "rich kids," "debauchery" and "deceitful charlatans" on campus. ABC, citing law enforcement sources, said that the note, several pages long, explains Cho's actions and says, "You caused me to do this."

Citing unidentified sources, the Tribune also said Cho had recently set a fire in a dorm room and had stalked some women.

Monday's rampage consisted of two attacks, more than two hours apart - first at a dormitory, where two people were killed, then inside a classroom building, where 31 people, including Cho, died. Two handguns - a 9 mm and a .22-caliber - were found in the classroom building.

Partial list of victims:   Liviu Librescu, 76, engineering science and mathematics lecturer. Kevin Granata, engineering science and mechanics professor. Ryan Clark, 22, of Martinez, Georgia, biology and English major. G.V. Loganathan, 51, civil and environmental engineering professor. Jamie Bishop, Instructor, Foreign Languages and Literatures (German). Ross Alameddine, 20, Saugus, Massachusetts, a sophomore English major. Daniel Perez Cueva, 21, a student from Peru who was studying international relations. Emily Hilscher Woodville, Virginia Freshman, Animal and Poultry Sciences, Equine Science. Maxine Turner Vienna, Virginia Senior, Chemical Engineering. Henry Lee Roanoke, Virginia Freshman, Computer Engineering. Matt La Porte Dumont, New Jersey Freshman, University Studies. Juan Ortiz, Graduate Student, Civil Engineering. Jarrett Lane Narrows, Virginia Senior, Civil Engineering. Leslie Sherman Sophomore, History and International Studies. Caitlin Hammaren Sophomore, International Studies and French. Reema Samaha Centreville, Virginia, freshman.

The Washington Post quoted law enforcement sources as saying Cho died with the words "Ismail Ax" in red ink on one of his arms, but they were not sure what that meant.

According to court papers, police found a "bomb threat" note - directed at engineering school buildings - near the victims in the classroom building. In the past three weeks, Virginia Tech was hit with two other bomb threats. Investigators have not publicly connected those threats to Cho.

Cho graduated from Westfield High School in Chantilly, Va., in 2003. His family lived in an off-white, two-story townhouse in Centreville, Va.

Two of those killed in the rampage, Reema Samaha and Erin Peterson, graduated from Westfield High in 2006. But there was no immediate word from authorities on whether Cho knew the two young women and singled them out.

"He was very quiet, always by himself," neighbor Abdul Shash said. Shash said Cho spent a lot of his free time playing basketball and would not respond if someone greeted him.

Classmates painted a similar picture. Some said that on the first day of a British literature class last year, the 30 or so students went around and introduced themselves. When it was Cho's turn, he didn't speak.

On the sign-in sheet where everyone else had written their names, Cho had written a question mark. "Is your name, `Question mark?'" classmate Julie Poole recalled the professor asking. The young man offered little response.

Cho spent much of that class sitting in the back of the room, wearing a hat and seldom participating. In a small department, Cho distinguished himself for being anonymous. "He didn't reach out to anyone. He never talked," Poole said.

"We just really knew him as the question mark kid," Poole said.

One law enforcement official said Cho's backpack contained a receipt for a March purchase of a Glock 9 mm pistol. Cho held a green card, meaning he was a legal, permanent resident. That meant he was eligible to buy a handgun unless he had been convicted of a felony.

Roanoke Firearms owner John Markell said his shop sold the Glock and a box of practice ammo to Cho 36 days ago for $571.

"He was a nice, clean-cut college kid. We won't sell a gun if we have any idea at all that a purchase is suspicious," Markell said.

Investigators stopped short of saying Cho carried out both attacks. But State Police ballistics tests showed one gun was used in both.

And two law enforcement officials, speaking on condition of anonymity because the information had not been announced, said Cho's fingerprints were on both guns, whose serial numbers had been filed off.

With classes canceled for the rest of the week, many students left town in a hurry, lugging pillows, sleeping bags and backpacks down the sidewalks.

Jessie Ferguson, 19, a freshman from Arlington, headed for her car with tears streaming down her cheeks.

"I'm still kind of shaky," she said. "I had to pump myself up just to kind of come out of the building. I was going to come out, but it took a little bit of 'OK, it's going to be all right. There's lots of cops around.'"

She added: "I just don't want to be on campus."

On Tuesday afternoon, thousands of people gathered in the basketball arena for a memorial service for the victims, with an overflow crowd of thousands watching on a jumbo TV screen in the football stadium. President Bush and the first lady attended.

"As you draw closer to your families in the coming days, I ask you to reach out to those who ache for sons and daughters who are never coming home," Bush said.

Virginia Tech President Charles Steger received a 30-second standing ovation, despite bitter complaints from parents and students that the university should have locked down the campus immediately after the first burst of gunfire.

Stories of heroism and ingenuity emerged Tuesday.

Liviu Librescu, an Israeli engineering and math lecturer, was killed after he was said to have protected his students' lives by blocking the doorway of his classroom from the gunman. And one student, an Eagle Scout, survived after using an electrical cord as a tourniquet around his bleeding thigh, a doctor reported.

Kevin and Cindy Deck of Roanoke met at Virginia Tech and graduated from the school. Their daughter Natalie is a fourth-year architecture student, while son Daniel is a freshman business major.

"We both went to work this morning," Cindy Deck said. "I teach school, and by the first bell ringing, I thought, I can't do this. I need to be with my kids. It's just one of those days you've got to be with them."

Her husband added: "We've been struggling with an immediate impulse just to run and grab our kids and bring them home."

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