By Cheryl Fiandaca

BOSTON (CBS) — Dozens of people are dead after a gunman opened fire at a country music concert in Las Vegas. The suspected shooter shot from the 32nd floor of the Mandalay Bay Hotel.

Stephen Paddock’s hotel room had an arsenal of more than a dozen weapons that police say were designed for maximum harm. Alongside the guns police found the 64-year-old dead from what appeared to be a self-inflicted gunshot wound.

paddock2 I Team: Vegas Shooter Used Employee ID, Spent Thousands Gambling Over Last Few Days

Stephen Paddock. (Photo credit: CBS News)

“The weapon selection really is going to speak to his state of mind and his experience with weapons,” said Paul Viollis, a CBS News law enforcement expert.

Sources say Paddock was a guest at the hotel and used the employee ID card of a woman who sources referred to as his wife. That woman, Marilou Danley, lived with Paddock and sources say her ID was used by him to go in and out of restricted doors at the Mandalay Bay hotel. Danley is an employee of the hotel.

venue I Team: Vegas Shooter Used Employee ID, Spent Thousands Gambling Over Last Few Days

People run from the Route 91 Harvest country music festival in Las Vegas during a mass shooting. (David Becker/Getty Images)

The I-Team has also learned she is an Australian citizen and has been located in Australia. Police say at this point they do not believe she was involved.

Paddock checked in to the hotel a few days ago and according to sources spent much of his time there gambling thousands of dollars at the casinos.

Police searched Paddocks’ home and another property he owned. He also owned a private plane and had a hunting license in Texas. Police said they found an additional 18 guns at Paddock’s home as well as thousands of rounds of ammunition, and explosives.

Retired, Paddock was an employee of an aerospace company that later became Lockheed Martin.

ISIS claimed responsibility for the attack but the FBI says Paddock had no connection to any international terrorists groups.

“Understanding his state of mind will be key to figuring out, what was the motive, was he an emotionally disturbed person and how did this all unfold,” said Fran Townsend, a CBS News analyst.

The motive for the attack still remains a mystery. The Nevada gun store that sold the guns to Paddock says he met all required background checks and never appeared to be unstable. The store is cooperating with police.

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