27 Dead in Connecticut Elementary School Shooting

Sandy Hook Elementary School Shooting Screengrab NBC - H 2012

Sandy Hook Elementary School Shooting Screengrab NBC - H 2012

UPDATED: Broadcast and cable news networks break in as they scramble to cover details in the suburban Fairfield County community.

News networks have gone wall-to-wall with coverage of a mass shooting at an elementary school in Newtown, Conn, where 27 have died: 18 children, the gunman, the school's principal and seven other adults.

The scene of the shooting is Sandy Hook Elementary School, about an hour northeast of New York City. At a news conference Friday afternoon, state police said an investigation is underway and the "public is not in danger."

The Associated Press is reporting that the gunman was a 20-year-old man with a connection to the school. A second person is being questioned in relation to the shootings, outlets reported.

President Obama was briefed Friday morning and also spoke with Connecticut's governor, expressing his condolences regarding the tragedy, according to the AP. "As a father, incidents like these weigh heavily on him," said White House spokesman Jay Carney

CBS News broke into regular programming at 12:07 p.m. ET. Rebecca Jarvis was headed to the scene, while CBS This Morning co-anchor Norah O’Donnell is anchoring the network’s special coverage. CBS Evening News anchor Scott Pelley will anchor Friday’s broadcast from Connecticut.

NBC's Brian Williams also was headed to the scene.

CNN says Susan Candiotti is reporting from Sandy Hook elementary, with Ashleigh Banfield and Jason Carroll covering the story as well. CNN International is simulcasting CNN, with CNN en Espanol, HLN and CNN.com also covering events live.