At least 50 people were killed and [over 400] others were injured in the attack. It is believed to be the deadliest shooting in U.S. history.

The gunman, who has been identified as 64-year-old Stephen Paddock, was killed during a confrontation with police shortly after.

Jason Aldean, Jake Owen, Lee Brice, Dylan Scott and Luke Combs were among those who performed at the concert.

"Gun shots were ringing off of the stage rigging and road cases. No one knew where to [go]," Owen wrote on Twitter.

"Praying for everyone here in Vegas," he wrote on Twitter. "I witnessed the most unimaginable event tonight. We are okay. Others aren't. Please pray"

He asked everyone to pray to God.

Jason Aldean later posted an emotional post on Instagram asking for people to pray for the victims.

"My thoughts and prayers go out to everyone involved tonight," he wrote in his post. "It hurts my heart that this would happen to anyone who was just coming out to enjoy what should have been a fun night."

Other country music performers also posted on social media they were praying for the victims.

Lee Brice:
"Hearts out to Vegas. Route 91 concert, stage I played two nights ago. Musicians, fans, workers, you are all in our prayers right now."

Dylan Scott:
"Prayers to everyone at @Route91Harvest in Las Vegas. We are ok, had literally just left for the airport.  What is wrong with this world!!"

LANCO music:
"Praying for everyone in Vegas. We were there last night and many of our friends are still there. Praying for you all."

Lauren Alaina:
"Praying for everyone at Route 91. That crowd was one of the best I've played for all year. This news is devastating. My camp is home & safe."

A number of Christian leaders also took to social media to rally everyone in prayer for the victims.

Franklin Graham tweeted: "Pray for the families of those killed and for the 100+ wounded in a shooting rampage last night in #LasVegas"

Beth Moore prayed for wickedness to come to an end.

Beth Moore:
"Oh Las Vegas. We are sorrowing & praying for you. Psalm 7:9 echoes from my morning reading: ‘Oh, let the evil of the wicked come to an end.’"

Others followed suit.

Paula White-Cain:
"I am praying for everyone affected by the tragic shooting in #LasVegas last night! I look to God for peace and strength!"

Dr. Robert Jeffress:
"Join me in prayer for the families of those killed and for the 200+ injured from last night's horrific Las Vegas massacre."

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