The sheriff leading the investigation into the Las Vegas shooting believes the gunman was not acting alone and that he most likely had an accomplice.
Speaking to reporters this afternoon, sheriff Joseph Lombardo said "he had to have some help".
Lombardo said investigators did not have any other suspects at this stage, but they were "determined to find out if there was".
"You look at the weapon obtaining, the different amounts of Tannerite [explosives] available, do you think this was all accomplished on his own?
"On face value, you've got to make the assumption he had to have some help at some point, and we want to ensure that that's the answer."