Stephen Paddock’s girlfriend may be hiding something from investigators who are trying to piece together the motive behind the Las Vegas massacre, the city’s sheriff suggested in a wide-ranging interview with a local television station.

Marilou Danley, who is still a person of interest in the case, has told authorities that she never knew the attack was coming. Sheriff Joseph Lombardo, in his first TV appearance in nearly three weeks, told KLAS that investigators he’s spoken to believe this assessment is accurate. But he added that something appears to be off about the manner in which Paddock amassed his arsenal of weapons.

“There is a lot of people that have hundreds and hundreds of guns, but for this individual to do it at a certain point in time and to do it all with such robust action, you would think that Ms. Danley would have some information associated with that,” he said. “But currently we haven’t been able to pull that out of her, if it’s in her.”

Lombardo added that Danley will be interviewed again this week and he suggested she could have prevented the massacre, which left 58 dead and hundreds injured.

“It could have been prevented on many levels,” Lombardo told KLAS’ George Knapp. “Marilou Danley, his brother, anybody that may have had some modicum of information that would have presented this individual’s state of mind, but apparently right now we don’t know that.