Why did Stephen Paddock do it? Investigators don't yet know

Stephen Paddock killed 59 and wounded hundreds over a period of about 10 minutes

Stephen Paddock killed 59 and wounded hundreds over a period of about 10 minutes

The Las Vegas gunman's girlfriend, back in the United States after a weekslong trip overseas, will be at the center of the investigation into the shooting deaths of 59 people as authorities try to determine why a man with no known record of violence or crime would open fire on a concert crowd from a high-rise hotel.

"He was so rude to her in front of us, ' Mendoza said, adding that Paddock always looked 'like he never slept because of the large bags under his eyes".

At this point, Paddock's motive and aims remain a mystery to investigators.

"No one can put the puzzles together".

Danley is the girlfriend of 64-year-old Stephen Paddock, who unleashed gunfire on attendees of the Route 91 Harvest Festival from the 32nd floor of the Mandalay Bay Resort and Casino.

Clark County Sheriff Joseph Lombardo told reporters Wednesday just after 9 a.m. local time that Danley would be questioned in the next half hour at the FBI's Los Angeles field office.

In the days before the shooting, Mr Paddock transferred $US100,000 ($A127,700) to the Philippines, a USA official briefed by law enforcement told the Associated Press on the condition of anonymity.

Paddock was found dead when police entered his hotel room.

More than two days after the deadliest mass shooting in modern USA history, the question of why someone with no known record of violence or crime would open fire on a country music festival was unanswered.

Investigators also found a computer and 23 guns with him at the hotel, along with 12 "bump stock" devices that can enable a rifle to fire continuously, like an automatic weapon, authorities said. She was in the Philippines at the time of the deadly attack that left 59 dead.

Danley, who it is believed was born in the Philippines, is reported to have lived on the Gold Coast in Queensland 20 years ago.

Public records on Paddock point to an itinerant existence across the US West and Southeast, including stints as an apartment manager and aerospace industry worker.

Reynaldo Bustos, her brother, told ABC News that he spoke to his sister following the shooting.

Mangrobang said authorities in the Philippines have been communicating with the Federal Bureau of Investigation and the US Department of Homeland Security. "She was sent away [sic]", one of her sisters said. The FBI is working with Philippine authorities to determine details. "We have discovered he was utilizing some of her identification".

A flight attendant from the plane declined to comment, as did an airline manager at the terminal, citing privacy concerns, when asked if they had seen Ms Danley.

Chris Sullivan, the owner of Mesquite's Guns & Guitars shop, issued a statement confirming that Paddock was a customer who cleared background checks and said his business was cooperating with investigators.

The guns were bought in Nevada, Utah, California and Texas, said Jill Snyder, special agent in charge of ATF field division in San Francisco.

Investigators also found explosives in his home and ammonium nitrate (used as a bomb ingredient) in his auto. Police said they're investigating the source of the leaked photos.

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