Las Vegas Metro Police hold a press conference to discuss the . During a press conference, Las Vegas Metro Police under Sheriff Kevin McMahill told reporters that the department is still unclear on shooter Stephen Paddock's motivation for the attack he perpetrated earlier this week. Lombardo also asked anyone with more information about the attack to come forward. He said that he believed that someone must have seen something that was out of place, whether it was suspicious activity, or someone who seemed to be acting strangely. The girlfriend of the man behind a recent mass shooting in Las Vegas told investigators he displayed “mental health symptoms” before the attack, according to NBC News. NBC News on Friday reported that one former FBI official briefed on the matter confirmed that Marilou Danley recently made the remark about Stephen Paddock. “[Danley] said he would lie in bed, just moaning and screaming, ‘Oh, my God,’” another former FBI official aware of the situation said. NBC News’s sources said Paddock may have been in mental or physical anguish before committing the worst mass shooting in modern U.S. history last Sunday. Accusations of fake news are everywhere lately. How well can you tell apart the actual fake headlines from the real ones in this quiz? Test your skills! The sources added, however, that the FBI has not yet identified what motivated Paddock to open fire upon an outdoor concert. The FBI also does not believe Paddock’s mental health had eroded to a point that would have triggered him to begin his rampage, according to NBC’s sources. Federal and state law enforcement officials additionally confirmed to NBC News that Paddock had been prescribed an anti-anxiety medication called Valium. Some Twitter users on Friday speculated about Danley and her reported remarks to investigators about her boyfriend. One of the former FBI officials said that investigators are additionally scrutinizing about six media devices Paddock left behind. The search includes an inquiry into Paddock’s web browsing history before he began shooting at a country music event last weekend. Responding police found Paddock dead inside his hotel room on the 32nd floor of the nearby Mandalay Bay Resort and Casino. The shooting killed at least 58 people and wounded more than 527 others, sparking renewed national debate over gun control.