Sunday on 'This Week' – Tragedy at the Elementary School

Sunday on a special edition of "This Week," George Stephanopoulos covers the latest developments in the devastating mass shooting at an elementary school in Newtown, Connecticut. Details continue to emerge after a lone gunman opened fire Friday morning at an elementary school in Newtown, CT, killing 20 children and 6 adults. On Sunday morning, "This Week" brings the latest reporting and analysis from the ABC News team covering the investigation and aftermath in Newtown, including live reports...Full Story