Stephen Paddock booked two rooms during the Lollapalooza music festival in August at Chicago's Blackstone hotel, which overlooks the expansive downtown park where the popular event was held, according to the website TMZ and NBC News.
In the days and months before he mowed down concertgoers from his high-rise hotel suite, gunman Stephen Paddock booked rooms overlooking two other music festivals in Las Vegas and Chicago, authorities said.
It was also reported that Paddock also attempted to book rooms at the Ogden, a luxury condo tower, during the Life is lovely festival in Las Vegas in late September - but found they were all taken. The official, who was not authorized to discuss the investigation of Paddock's movements, spoke only on condition of anonymity after being briefed on the investigation.
Investigators are probing the Las Vegas gunman's interest in other music festivals in the months before he killed 58 people and injured almost 500 at an outdoor country concert.
Sheriff Lombardo also confirmed reports Paddock had rented a hotel room above another music festival just a week before the massacre.
Among the 400,000 attendees at this year's Lollapalooza was former President Barack Obama's oldest daughter Malia, and acts on stage included The Killers, Chance the Rapper, Muse and Charli XCX.
Chicago Police Department spokesman Anthony Guglielmi would not confirm the TMZ report about Paddock's plans in Chicago, but said the department is aware of the report. He later booked a second room for August 3 through August 6, the same days as Lollapalooza in Grant Park.
The Chicago hotel's proximity to the outdoor concert stadium suggested a similar scenario to the Las Vegas mass shooting, which killed 58 and injured nearly 500.
But he ultimately chose to mount an attack from the Mandalay Bay Resort and Casino across the street from the Route 91 Harvest country music festival held last weekend.
"This individual and this attack didn't leave the sort of immediately accessible thumbprints that you find on some mass casualty attacks", McCabe said.
Australian police are assisting their USA counterparts on the investigation into Las Vegas shooter's girlfriend Marilou Danley. However, officials have repeatedly said that they have so far found absolutely no links to worldwide terror groups and have cast doubt on the claim.
"He never said anything to me or took any action that I was aware of that I understood in any way to be a warning that something disgusting like this was going to happen", Marilou Danley, 62, said in a statement read by her lawyer outside Federal Bureau of Investigation headquarters in Los Angeles.
Discerning Paddock's motive has proven especially baffling as he had no criminal record, no known history of mental illness and no outward signs of social disaffection, political discontent or extremist ideology, police said. We don't know yet, ' Sheriff Lombardo said.