A gunman (now identified by authorities as 64 year-old Stephen Paddock) killed at least 58 people and injured more than 500 more after opening fire from a hotel room high above an outdoor country music concert in Las Vegas late Sunday night. It's been noted by some reports as the deadliest mass shooting in modern American history.

In the aftermath of the tragedy, athletes from around the country expressed their sorrow and sent condolences to victims with messages on Twitter.

At Arrowhead Stadium in Kansas City, there was a moment of silence before the Chiefs-Redskins Monday Night Football game in honor of all those affected by the horrific event, with the American flag flown at half-staff.

One of the more prominent athletes to speak up in the wake of the attack was Washington Nationals outfielder Bryce Harper. Harper was born and raised in Las Vegas.

Fellow Vegas natives DeMarco Murray of the Tennessee Titans and NASCAR drivers Kyle and Kurt Busch echoed Harper's sentiments.

Other prominent sports figures associated with Vegas, such as professional poker player Phil Hellmuth and UNLV football coach Tony Sanchez, added their thoughts as well.

The UNLV hockey team announced via Twitter that assistant coach Nick Robone was injured in the shooting. At last update, the team said he was out of the intensive care unit.

The Vegas Golden Knights of the NHL, the only professional sports franchise currently in Las Vegas, released a statement offering their "full support to the people of Las Vegas." The Oakland Raiders, which will be relocating to Vegas in 2020, also released a statement. A few Raiders also tweeted about the shooting.

Outside of those with specific connections to Vegas, a number of athletes -- such LeBron James, Chris Paul, Carson Wentz and Dale Earnhardt Jr. -- tweeted about their shock, disbelief and sorrow.

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Cy Brown writes about football, golf, soccer and other stuff for Sports on Earth. Follow him on Twitter@CEPBrown.