"Over the last 24 hrs I have gone through lots of emotions", he said in a message posted on his official Instagram account Tuesday.
After the terrible massacre at a Las Vegas music festival on Sunday night that killed 58 and wounded hundreds more, concerns emerged immediately about other sites that could be vulnerable to a similar attack.
Mr Lombardo said the scale of the preparations for the attack - including the weapons, ammunition and electronics he had stockpiled - raised questions about Paddock potentially having had an accomplice.
But one of Nevada's few restrictions is on the sale or manufacture of automatic weapons, and the Associated Press reports that Paddock used a legal device to effectively circumvent that.
Senior US officials have discounted these claims, saying there is no evidence connecting Paddock with global terror groups.More news: Nadal sets up quarter-final clash with Isner
"It never occurred to me in any way whatsoever that he was planning violence against anyone".
Mendoza said they always ordered the same drinks - a venti mocha cappuccino for him and a medium caramel macchiato for her.
He said law enforcement were working four separate crime scenes: Paddock's room at the Mandalay Bay hotel, the concert venue, the gunman's house in Mesquite, and another house he owns in northern Nevada which a SWAT team was poised to raid.
After Sunday attack, authorities in the United States, the Philippines and Australia joined efforts to search for Danley, hoping she might shed some light on the motive behind the deadliest mass shooting in modern U.S. history. "Only Marilou can maybe help", Danley's sister said.
"I knew Stephen Paddock as a kind, caring, quiet man", Danley said in the statement.
More background information on the shooter is also coming to light.More news: Edward Heath Would Have Faced Sex Abuse Inquiry, Say UK Police
Marilou Danley, 62, arrived back in the US late Tuesday at Los Angeles International Airport from the Philippines and was being questioned by the Federal Bureau of Investigation.
He reportedly lived with a woman called Marilou Danley who was out of the country in Japan and did not appear to be involved in the shootings, police said.
Trump, touring a hospital in Las Vegas, told reporters Paddock was "very demented", and he asked Lombardo if investigators were any closer to establishing a motive.
It took about 10 minutes for Stephen Paddock to carry out the deadliest mass shooting in modern U.S. history.
"Good for them - no, we have no evidence of that".More news: Former Equifax chief apologizes for data breach to House panel