Marilou Danley issued the statement after returning from her native Philippines and being questioned for much of the day by Federal Bureau of Investigation agents still trying to figure out what drove Stephen Paddock to open fire on 22,000 fans at a country music festival from his 32nd-floor hotel suite.
Suarez said the NBI was looking into reports Danley arrived in the Philippines last month, and that Paddock had sent $100,000 to her via a wire transfer.
A search of Paddock's vehicle turned up a supply of ammonium nitrate, a fertiliser that can be formed into explosives and was used in the 1995 Oklahoma City bombing of a federal office building that killed 168 people.
Ms Danley's two sisters told 7 News Australia that they believe she was "sent away" so she could not interfere with her boyfriend's plan to open fire on thousands of people.
Investigators initially distanced Paddock's murderous rampage from terrorism but with the lack of a motive, Ms Danley's presence in the Philippines and reports Paddock wired $US100,000 ($139,000 NZD) to the terrorism hot spot, authorities refused to rule it out.
Paddock, from Mesquite, Nevada, killed himself before officers stormed Room 135 in the gold-coloured glass skyscraper.
Two Nevada gun shops have confirmed that they sold firearms to Paddock in the past year and said he passed all required background checks. "This individual is a lone wolf and I don't know how it could have been prevented", he said earlier.
Paddock had booked room 32135, described by Las Vegas Metropolitan Police Department Sheriff Joseph Lombardo as one large suite with uninterrupted views of the Las Vegas Strip. "They were saying that 'We're going to die, we're going to die, ' and I still remember telling them: 'Not tonight, not tonight". At least 59 people were killed in the attack and more than 500 were injured.
She added to reporters that "US authorities were in contact with us about Marilou Danley".
Danley, an Australian citizen aged 62 who is reported to have been born in the Philippines, was not seen by reporters in any public area of the LAX arrival terminal.
Throughout his four-hour visit to Las Vegas on Wednesday afternoon, Trump repeatedly praised police, first responders and average Americans who quickly worked to save the lives of others on Sunday.
So far, investigators have found nothing to explain Paddock's actions, but were continuing to hunt and trace every possible clue about a gunman they described as a "psychopath".
Sunday's shooting left Las Vegas a city in mourning.
"The people are hurting and they want to lash out and they are lashing out at the wrong family, wrong people", Geary's daughter said. Hundreds of rounds. The sheriff said that there were several firearms found in the room.
"Listening to the video, it sounds like the weapons were fully automatic", said Cohen, who is now an ABC News consultant.
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