Amid an outpouring of grief and condolences as the death toll climbed higher from Monday's mass shooting in Las Vegas, Nevada, one US senator sent out a tweet, pointing an angry finger at his colleagues on Capitol Hill. There were also some handguns in the room. None of the details of his emerging portrait - that he owned two planes, gambled big, travelled around the country and lived a lavish life, staying frequently in luxury resorts - provide helpful clues about his motive. They are investigating whether those stocks were used to modify weapons used in the massacre, according to the officials, who were briefed by law enforcement and spoke on condition of anonymity because the investigation is still unfolding.

As well as the bump stocks that apparently let Vegas shooter Stephen Paddock fire a semi-automatic rifle nearly as rapidly as illegal fully automatic guns. Records show that Paddock had owned at least 30 guns at one time or another.

The president called the attack on a Las Vegas concert an "act of pure evil" during remarks Monday.

-At least 59 people were killed and more than 500 hurt in a shooting last night.

Trump also called for unity in the aftermath of the shooting, the largest in United States history.

"Thoughts and prayers need to be matched by action", Murphy said later on the Senate floor. In American Outdoor Brands' annual report, the firearms manufacturer told investors several times that "speculation surrounding increased gun control at the federal, state, and local level and heightened fears of terrorism and crime" will affect the demand for guns. "He never gave any indication or reason to believe he was unstable or unfit at any time". "We are now cooperating with the ongoing investigation by local and federal law enforcement in any way we can", Sullivan said.

Simple but highly illegal after-market modifications can also change semiautomatic weapons into automatic weapons.

-A gun store in Mesquite sold firearms to the gunman.

"The investigation has not even been completed", Senate Majority Leader Mitch McConnell said, "and I think it's premature to be discussing legislative solutions, if there are any".

"I'm calling on all Americans who are responsible gun owners to weigh in", Chief Acevedo said. "That would be very hard to do with anything other than an automatic weapon", Cohen said.

Stephen Paddock's ability to kill scores of concertgoers Sunday night may have come from using modified semi-automatic weapons with high-capacity magazines, something that enabled him to shoot hundreds of rounds in just a few minutes.