Details from the timeline of police response to the Dec. 14 Sandy Hook Elementary School shooting from a report issued Monday by State's Attorney Stephen Sedensky III:
9:35:39 a.m. — Initial 911 call reporting shots fired in school.
9:39:00 — Officer Michael McGowan arrives behind the school. McGowan states that he hears numerous gunshots.
9:39:13 — Sgt. David Kullgren and Officer William Chapman, followed by Officer Scott Smith, arrive at school and park next to nearby ballfield.
9:40:03 — Last shot is heard. It is presumed that shooter Adam Lanza killed himself.
9:41:24 — McGowan detains parent Christopher Manfredonia outside the school. The parent heard shots and ran toward playground area. Several Newtown officers respond to McGowan's call for assistance, including Chief Michael Kehoe and Captain Joseph Rios.
9:44:47 — Newtown officers Leonard Penna, Lt. Christopher Vanghale and Sgt. Aaron Bahamonde enter the school through boiler room door.
9:44:50 — Three other Newtown officers, Kullgren, McGowan and Liam Seabrook, enter through the rear of the school.
9:46:23 — First state police officers arrive. Lt. Michael Hofbauer, Lt. Michael Davis and Sgt. William Cario run into the building through front glass window Lanza shot out.
9:51:31 — A four-man team consisting of Cario, Davis, Chapman and Smith enters teacher Victoria Soto's classroom and find Lanza's body.