The United States President, Donald Trump on Tuesday called the gunman "demented", who went on to shooting spree, killing 59 people and injuring more than 500 others.
"It is a "miracle" how fast the Las Vegas Metropolitan Police were able to find the demented shooter and stop him from even more killing!" Trump tweeted.
The local authorities in Las Vegas have said that the mass shooting of around 600 people, which killed 59, was premeditated and pre-planned.
"Every detail of this indiscriminate mass murder seemed meticulously planned," the local media reported.
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The Police said gunman Stephen Paddock set up cameras inside his hotel suite and in the hallway. Police are not aware whether the devices were transmitting -- the FBI is investigating their use.
However, the Clark County sheriff told reporters he thinks the shooter might have used them to watch for people approaching his room.
Investigators probing the Las Vegas massacre have searched gunman Stephen Paddock's home and recovered 42 firearms, an assortment of explosives and several thousand rounds of ammunition from his Las Vegas hotel room and his Mesquite home.
The Las Vegas mass shooting is the deadliest mass shooting in modern American history, claiming the lives of 59 people and injuring 527 others.
Earlier, Trump used a brief address from the White House to call for unity in the aftermath of the deadliest mass shooting in modern U.S. history, calling it an "act of pure evil."
"We cannot fathom their pain, we cannot imagine their loss," Trump said of those who lost loved ones in the massacre.
"There's a time and place for a political debate, but now is the time to unite as a country," Sanders said. "There's currently an open and ongoing law enforcement investigation, a motive is yet to be determined and it would be premature for us to discuss policy when we don't fully know all the facts or what took place last night.