Hillary Clinton said Monday that members of Congress need to take action on passing gun control legislation, and urged lawmakers to oppose a bill that would make it easier to purchase gun suppressors in the wake of Sunday night's shooting at a country music festival in Las Vegas.

"Las Vegas, we are grieving with you—the victims, those who lost loved ones, the responders, & all affected by this cold-blooded massacre. The crowd fled at the sound of gunshots. Imagine the deaths if the shooter had a silencer, which the NRA wants to make easier to get," Clinton said in a series of tweets Monday morning. "Our grief isn't enough. We can and must put politics aside, stand up to the NRA, and work together to try to stop this from happening again."

Our grief isn't enough. We can and must put politics aside, stand up to the NRA, and work together to try to stop this from happening again. — Hillary Clinton (@HillaryClinton) October 2, 2017

The crowd fled at the sound of gunshots.



Imagine the deaths if the shooter had a silencer, which the NRA wants to make easier to get. — Hillary Clinton (@HillaryClinton) October 2, 2017

Las Vegas, we are grieving with you—the victims, those who lost loved ones, the responders, & all affected by this cold-blooded massacre. — Hillary Clinton (@HillaryClinton) October 2, 2017

At least 50 people were killed and 400 were injured after a gunman, identified as 64-year-old Stephen Paddock, opened fire on concert-goers at the Route 91 country music festival Sunday night.

Police said Paddock fired down at the crowd from a hotel room on the 32nd floor of the Mandalay Bay Hotel and Casino. He is believed to have committed suicide before law enforcement broke into the room.

Clinton joined several other Democrats in Congress calling for action on gun control, including Sens. Richard Blumenthal of Connecticut and Elizabeth Warren of Massachusetts.

The National Rifle Association's Institute for Legislative Action backed a bill, called the Hearing Protection Act, earlier this year that would make it easier to purchase gun suppressors.

The measure was included in a bipartisan bill that "expands access to hunting, fishing and recreational shooting." That bill passed out of the House Natural Resources Committee last month, and the House was expected to vote on the measure in the coming days.