Las Vegas shooter Stephen Paddock who gunned down 59 people at a music festival last week had visited the Middle East on a cruise past year, a police has revealed.
He killed 58 people and wounded hundreds of others last Sunday before taking his own life.
"We are united in our grief, in our support for those who have suffered and united in our resolve to end such evil in our time", Pence said, joining Las Vegas Mayor Carolyn Goodman and other local leaders at a City Hall commemoration for victims of the shooting that followed a prayer walk through the city.
McMahill said investigators had uncovered "no nexus" between Islamic State and Paddock, even though the militant group had repeatedly claimed responsibility for the attack.
Paddock said he was prescribed Valium by Nevada doctor Steven Winkler, and that he kept Winkler "on retainer", although he didn't indicate how often he took the anxiety drug.
Lombardo said Jesus Campos, a Mandalay Bay security guard, first confronted gunman Stephen Paddock after going to the 32nd floor of the hotel to investigate a door alert in another guest's room, according to reports.
Charles "Sid" Heal, a retired Los Angeles County sheriff's commander and tactical expert, said the new timeline "changes the whole perspective of the shooting".More news: How Smart Speakers Differ Pricewise
Lombardo declined to reveal what they've said, but he stated, "Every piece of information we get is one more piece of the puzzle".
Billboards will serve as a stark reminder that investigators remain stumped about what drove a gunman to mow down people from his casino hotel room last Sunday.
But Paddock may have been scouting other locations, including the Life is attractive music festival, which was held in Las Vegas the weekend before Sunday's attack.
Those seeking to know the motive of Las Vegas gunman Stephen Paddock have had little more to chase than hints and shadows.
People who knew Paddock described him as anti-social, someone who went out of his way to avoid other human beings, but his girlfriend said she saw no indication that he was capable of such horror.
"Then immediately, upon being injured, he notified security", Sheriff Joseph Lombardo said of the hotel guard at a Monday evening briefing. He checked into a hotel room overlooking the music festival, stocked a cache of weapons there and set up cameras inside his hotel suite and hallway.
Investigators have examined Paddock's politics, his finances, any possible radicalization and his social behavior _ typical investigative avenues that have helped uncover the motive in past shootings.
"Just in general, the sheer size of the space, the amount of personal items that were left there, it's just a huge undertaking", Flood said. But they can also give away the shooter's position.More news: 13th person from Hollywood nursing home dies, lawyer says
"It never occurred to me in any way whatsoever that he was planning violence against anyone", Danley said in the statement.
"So many guns", Newton said in the television interview.
Investigators want to know whether Paddock's girlfriend, Marilou Danley, has information that can explain what sparked the massacre.
"I could see on it he had written the distance, the elevation he was on, the drop of what his bullet was going to be for the crowd.
Everything that he had, it took him days to finish", Bitsko said.
Las Vegas police officer David Newton told CBS News program 60 Minutes on Sunday that he entered the room and saw a note on the shooter's nightstand with numbers that appeared to be created to help his aim.
However, McMahill said that they found the explosive in a condition that did not resemble an improvised explosive device (IED).More news: India failed to cause problems for opponents, says coach Matos
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