"Our Collective Hearts Are Breaking": Responses To Las Vegas Shooting Pour In

Photo: Drew Angerer/Getty Images.
Once again this morning, people across America — and the world — woke up to news of a horrific mass shooting.
More than 50 people were killed and about 200 were injured when a gunman opened fire during a Las Vegas country music festival overnight. It's believed to be the deadliest mass shooting in U.S. history.
Already, leaders across the political spectrum are reacting to the news, offering condolences to those impacted. Ahead, we've rounded up some of those responses.
This is a developing story. Check back for updates.