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Mr.

Grewal said he went back to sleep but, according to authorities, Cho stayed awake.

According to school officials, Cho even posted a deadly warning on a school online forum.“im going to kill people at vtech today,” they said he wrote.By around 7:15 a.m.

Monday, Cho had left his Harper Hall dorm for West Ambler Johnston dormitory.

There he went to see Emily Hilscher, described as a friend by officials.

She and the resident adviser, who came to investigate, were shot to death.As police investigated, Cho was on the move.

He had a backpack containing knives and ammo magazines, sources said.

He was armed with two handguns.After leaving the scene of the first shooting, Cho telephoned authorities with a threat, saying there was a bomb at Norris Hall, about half a mile away from Johnston.At Norris, officials said Cho chained shut the doors from the inside and began shooting people.

Thirty were killed before Cho turned the gun on himself, officials said.“He did not seem like a guy that’s capable of anything like this,” Mr.

Grewal said.Among the dead was Romanian-born Liviu Librescu, a dual U.S.-Israeli citizen who moved two decades ago to the United States and taught in the engineering science and mechanics department at Virginia Tech.Students described how Mr.

Librescu, 76, used his body to barricade the door against Cho so they could escape by jumping out ...

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