Mr. Mauro was in a second-floor classroom and said he did not hear the shooting.
Sparks quickly spread the fire to the thatched roof of the crowded second-floor classroom.
Mrs. Watanachaiyot pointed to Room 201, a second-floor classroom above the main entrance, where he had taken the last chair in the back.
A few second-floor classrooms are used for Collegiate classes during the academic year.
A wide portion of the school's roof collapsed, and the massive downward rush of heat killed instantly anyone remaining in the second-floor classrooms.
Surviving children said as many as 190 third, fourth and fifth graders were trapped in a single large second-floor classroom where all of the victims died.
There are two second-floor classrooms and a Veteran's Administration office.
In the second-floor classroom that he used for an office, the General had worked almost without pause all day.
Upstairs, Oleg Kasumov picked through the ruins of a second-floor classroom.
If I walk over there, I can see into the second-floor classrooms, he thought.