Police say they're increasing security for Sunday's Chicago Marathon after a gunman opened fire on an outdoor music festival in Las Vegas earlier this week, killing 59 people.
Stephen Paddock, the gunman in the Las Vegas massacre, booked two rooms in the Blackstone Hotel overlooking Lollapalooza, according to TMZ. That festival attracts hundreds of thousands of people to the downtown Chicago park, which is framed by tall buildings.
The official also told ABC News housekeeping was asked not to visit the suspect's hotel room for at least part of his stay.
He booked a second room for an August 3 arrival.
The initial TMZ story said Paddock booked one room for August 1, two days before Lollapalooza kicked off and then booked a second room, both with checkout dates of August 6, when the festival ended.
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They were investigating multiple leads across the United States and the world but said: "We can not give in to conjecture and we can not respond to every little Twitter feed that may indicate a theory".More news: Nobel Prize in Chemistry to Jacques Dubochet, Joachim Frank, Richard Henderson
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Police recovered almost 50 firearms from three locations they searched, almost half of them from the hotel suite.
In the days after the attack, it remained unclear why Paddock carried out his attack.
A lawyer for Marilou Danley read a statement from her after she was questioned by Federal Bureau of Investigation agents in Los Angeles about her boyfriend. "We don't know yet", Lombardo said.
Investigators questioned her about Paddock's weapons purchases, a US$100,000 (Dh367,317) wire transfer to a Philippine bank that appeared to be intended for her, and whether she saw any changes in his behaviour before she left the US.
Danley, who was overseas for more than two weeks, said she was initially pleased when she was wired money from Paddock to buy a house for her family in the Philippines.
The FBI's Aaron Rouse said they were aware Paddock was gambling before the shooting. But she later feared it was a way to break up with her.
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.