A young boy is comforted outside Sandy Hook Elementary School after a shooting in Newtown, Conn., Friday. Photo by Michelle McLoughlin/Reuters As we learn more about Friday's shooting that left at least 28 dead, including 20 children, at an elementary…

A shooting Friday at Sandy Hook Elementary School in Newtown, Conn., has left at least 27 dead including 20 children, according to the Associated Press. We collected tweets, photos and updates as events unfolded Friday.

A gas mask was marked as the first piece of evidence in a criminal investigation. Federal authorities searched through evidence in the parking lot behind the Century 16 movie theater where a gunman shot and killed 12 people Friday morning.

They just keep coming. When we arrived in Tucson on Sunday afternoon, we went to University Memorial Hospital, where Rep. Gabrielle Giffords was in intensive care. It was chaotic. Frustrated police officers did their best to direct heavy traffic…

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