A look back at the worst mass shooting in modern U.S. history that took the lives of 49 people in Orlando, Florida a week ago. Rough Cut - Subtitled (no reporter narration).
ROUGH CUT - SUBTITLED (NO REPORTER NARRATION) It was a week ago when Omar Mateen walked into the Pulse nightclub in Orlando, Florida and opened fire, killing 49 people and wounding 53 others in what has become the worst mass shooting in modern U.S. history. Authorities are still investigating what motivated Mateen to carry out the attack. He was killed in a shoot-out with police. The shooting has sparked a new push for gun control legislation and Congress is expected to vote on proposals starting next week, including one on stopping people on terrorism watch lists from buying guns. Democrats, including President Barack Obama, are framing gun restrictions as a national security issue after Mateen professed loyalty to Islamist militants. But authorities believe he was "self-radicalized" and acted without any direction from outside networks.