Sign up for our daily briefing
Make your busy days simpler with Axios AM/PM. Catch up on what's new and why it matters in just 5 minutes.
Stay on top of the latest market trends
Subscribe to Axios Markets for the latest market trends and economic insights. Sign up for free.
Sports news worthy of your time
Binge on the stats and stories that drive the sports world with Axios Sports. Sign up for free.
Tech news worthy of your time
Get our smart take on technology from the Valley and D.C. with Axios Login. Sign up for free.
Get the inside stories
Get an insider's guide to the new White House with Axios Sneak Peek. Sign up for free.
Catch up on coronavirus stories and special reports, curated by Mike Allen everyday
Catch up on coronavirus stories and special reports, curated by Mike Allen everyday
Want a daily digest of the top Denver news?
Get a daily digest of the most important stories affecting your hometown with Axios Denver
Want a daily digest of the top Des Moines news?
Get a daily digest of the most important stories affecting your hometown with Axios Des Moines
Want a daily digest of the top Twin Cities news?
Get a daily digest of the most important stories affecting your hometown with Axios Twin Cities
Want a daily digest of the top Tampa Bay news?
Get a daily digest of the most important stories affecting your hometown with Axios Tampa Bay
Want a daily digest of the top Charlotte news?
Get a daily digest of the most important stories affecting your hometown with Axios Charlotte
Concertgoers at Lollapalooza in Chicago on August 6, 2017. Photo: Rob Grabowski / Invision via AP
Stephen Paddock, who killed at least 59 and injured 527 after a shooting spree in Las Vegas, booked rooms at a Chicago hotel overlooking Grant Park in August — the same time as the Lollapalooza music festival, attended by thousands, per the Chicago Tribune. Paddock also researched hotels in Boston, in the vicinity of Fenway Park, officials briefed on the investigation told NBC.
The backdrop: Nine months before the Las Vegas shooting, the FBI and the Department of Homeland Security issued a joint report, obtained by Foreign Policy, warning of lone offenders targeting mass gatherings, such as music venues and sporting events. "Unaffiliated lone offenders and [homegrown violent extremists] are of particular concern due to their ability to remain undetected until operational," the report said.