(FOX NEWS) In less than five minutes, a gunman shot his way into Sandy Hook Elementary School and killed 26 people inside, then took his own life, leaving more than 150 spent rounds in his wake, according to documents released Thursday.

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Danbury State's Attorney Stephen Sedensky says Adam Lanza killed 20 first-graders and six adults using a Bushmaster .223-caliber rifle before taking his own life with a Glock 10-mm. handgun. Sedensky says Lanza had another loaded handgun with him inside the school, as well as three, 30-round magazines for the Bushmaster.

The documents say Lanza was found dead in the school wearing a bulletproof vest and military-style clothing, according to the Associated Press.

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