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Input: The shooter  Stephen Paddock  64  was seen on numerous occasions in Las Vegas without any person accompanying him and he gambled the night before the shooting   Clark County Sheriff Joseph Lombardo  said at a news conference.  He  killed  himself  after the attack.
âThis individual purposely hid  his  actions leading up to this event  and it is difficult for us to find the answers â said  Lombardo   who said  he  was frustrated with the speed of the investigation.
Paddock sprayed an outdoor concert with bursts of gunfire from high above in a Las Vegas hotel window on Oct. 1  killing 58 and wounding hundreds more  before shooting  himself .
âIn coordination with the FBIâs behavioral analysis unit  a comprehensive picture is being drawn as to the suspectâs mental state and currently we do not believe there is one particular event in the suspectâs life for us to key on â  Lombardo  said.
There is no indication anyone other than Paddock fired on the crowd   Lombardo  said  adding investigators are talking to family members and the girlfriend of the gunman.
Paddock shot and wounded a security guard who came to his floor at the Mandalay Bay hotel to investigate an open door down near Paddockâs suite   Lombardo  said  providing new details on what occurred immediately before the mass shooting.
Paddock shot the guard at 9:59 p.m. local time   Lombardo  said  shortly before raining down bullets on the Route 91 Harvest festival in an attack that began at 10:05 p.m. and lasted 10 minutes.
Paddock had a document in the room with him that contained numbers   Lombardo  said  adding  he  could not immediately say what purpose the figures served.
Las Vegas police officer David Newton told CBS News program â60 Minutesâ on Sunday that  he  entered the room and saw a note on the shooterâs nightstand with numbers that appeared to be designed to help  his  aim.
It was unclear why Paddock stopped firing at the crowd  suggesting he may have initially planned to escape   Lombardo  said.
 He  shot at jet fuel tanks at McCarran International Airport and had protective gear in the hotel suite and explosives in  his  parked car   Lombardo  said.

Las Vegas gunman fired on security guard before mass shooting