The amount of festivals held near high-rise hotels and office buildings is not exclusive to Las Vegas and Chicago, and includes multiple festivals nationwide. The Mesquite, Nevada man killed 59 people Sunday night and wounded more than 500 others at a music festival, firing high-powered rifles from his 32nd-floor room at the Mandalay Bay Resort & Casino in what was the deadliest mass shooting in modern USA history. He later booked another room for a stay beginning on August 3, the day the festival started.
The dates of the reservations covered the four-day event, which drew hundreds of thousands of music fans, including former president Barack Obama's daughters Malia and Sasha, as well as Mayor Rahm Emanuel. Chance the Rapper was one of the featured acts on the program.
It's unclear what locations in Boston Paddock looked into, but NBC News' Pete Williams suggests that, like in Las Vegas, the 64-year-old shooter was considering into hotels overlooking outdoor festivals.
Police said there is "currently no known threat to the Metro Boston Homeland Security Region related to this incident".
Shortly after the Life is lovely festival ended, Paddock checked into a 32nd-story suite at the Mandalay Bay Resort and Casino. He had also considered this year's Lollapalooza in Chicago.
Sunday's mass shooting was the deadliest in United States history, killing 59 people and injuring nearly 500 more.
Police are still searching for a motive in the attack.
Clark County Undersheriff Kevin McMahill said the shooting spanned between nine and 11 minutes. He did not elaborate how: "I can't tell you".
Police said Paddock did leave a note, and that he may have been trying to escape after the shooting.
His girlfriend, Marilou Danley, told FBI agents Wednesday that she had not noticed any changes in his mental state or indications he could become violent, the federal official said.
City officials say they've also met with security staffs of Chicago high rises.