LOS ANGELES (CBSLA) — The Las Vegas gunman’s girlfriend arrived at Los Angeles International Airport Tuesday night and will be taken by authorities for what is expected to be intense questioning, according to law enforcement sources.

Investigators are taking a harder look at Marilou Danley and what she might have known about the attack at a country music festival Sunday. Clark County Sheriff Joseph Lombardo has named her a “person of interest” and says the FBI is bringing her back to the U.S. for questioning.

Danley, 62, was out the country at the time of the shooting and in the Philippines on Tuesday. “We anticipate some information from her shortly,” Lombardo said.

One passenger noticed a large law enforcement presence when she got off the flight.

“I was one of the last people that got off the plane,” Rachael Santos said. “I travel all the time and I’ve never seen police like right outside…different uniform than the LAPD…kinda like nervous, I was like ‘what’s happening here?’ ”

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The high-stakes gambler and retired accountant who opened fire on the concertgoers, killing 58, and then taking his own life, had transferred $100,000 to the Philippines in the days before the attack, a U.S. official said.

It is not clear if the interrogation will take place in Los Angeles or Las Vegas.

(© Copyright 2017 CBS Broadcasting Inc. All Rights Reserved. The Associated Press contributed to this report.)