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Authorities still looking for a motive for Las Vegas shooting suspect Stephen Paddock are speaking with Paddock's girlfriend, Marilou Danley, for more information.

The domestic terrorist behind the Route 91 Harvest Festival shooting in Las Vegas has been identified as Stephen Paddock.

On Sunday night, at least 59 people were killed and 527 injured on the Las Vegas Strip when a gunman shot at concert-goers from a 32nd floor room of the Mandalay Bay Resort and Casino.

Baristas told the paper they would wince when Paddock came in with Marilou Danley, because he regularly belittled and berated her in front of customers and staff. "She was away so that she will not be there to interfere with what he's planning".

"I know that she don't know anything as well like us", Danley's sister, whose name was not given, tells 7 News, a CNN affiliate in Australia (Danley's sister lives in Australia's Gold Coast region). "This poor lady, she was in the Philippines visiting family", the acquaintance said according to the newspaper. Explosives were found at the home and in his Paddock's auto.

Marilou Danley returned to the United States on Tuesday night from the Philippines.

Philippines' Foreign Affairs Department said they do not have confirmation if Danley is a Filipino.

"I can tell you I'm very troubled by it", he said.

"It made me physically ill to think that we had interacted with him and he had committed such a tragedy", said Christopher Sullivan, general manager of Guns & Guitars in Mesquite, Nevada, a shop near Paddock's home.

Earlier this week, Ms Danley's nephew Jordan Knights told 9NEWS he had met Paddock on a recent trip to the USA to visit his aunt.

Danley is cooperating with authorities in the investigation, Lombard said.

He said he last talked to Stephen Paddock after Hurricane Irma, he said that Stephen asked about her 90-year-old mother's well-being and also asked about the power outage.

Paddock rented a room in downtown Las Vegas about the same time as an alternative music festival on September 22-24, where artists including Lorde, Chance the Rapper and Muse performed, but police do not know why. It is not believed, at this time, that she had any connection to the massacre. Please respect my privacy and my family's privacy.