New Details of Gunman Adam Lanza's Movement Inside School

Insight on the choices Lanza made as the lone gunman at Sandy Hook Elementary School.
1:58 | 12/16/12

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Transcript for New Details of Gunman Adam Lanza's Movement Inside School
This evening there are new and chilling. And what it was all over the little lies authorities found staring back at them -- been hiding. Waiting to be rescued here's ABC's Dan Harris tonight. After Adam lands -- shot his way through the glass near the front entrance of the school on Friday at around 9:40 AM. He had choices -- it could have gone to the right to the cafeteria. Where according to the Hartford current newspaper students were rehearsing a play straight ahead to the principal's office or left toward -- first grade classrooms. He went left and that's when he encountered a principal and a school psychologist who as we know local officials say died trying to stop lands -- In the first classroom -- entered he shot and killed -- Russo a substitute teacher. And 151. Graders all but one of the students. Then he went to the classroom of teacher Victoria Soto who the paper says was hiding her students. -- tried to convince lands of the kids were actually on the other side of the building but when a group of students suddenly tried to get away. Lands a shot them Soto and a special Ed teacher. It was only after police arrived that they found other students the -- says they were hidden in a closet. Today the governor of Connecticut told ABC's George Stephanopoulos. The Rampage only ended at around 950 about ten minutes after it began -- -- -- heard a wailing sirens approaching and killed himself. With one bullet to the head. We surmise that. It was during for the second classroom episode. That he heard responders coming in and apparently at that decided to take his own life. Also today school officials announced that sandy hook elementary students will in a matter of days start attending classes at an unused school -- neighboring town. After that though they face a wrenching decision do they ever reopen. Sandy hook elementary. David.

This transcript has been automatically generated and may not be 100% accurate.

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