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Two improvised explosive devices were also found nearby, according to police.

The FBI has said the black flag of the Islamic State group was found inside the vehicle which ploughed into partygoers, along with two suspected improvised explosive devices discovered nearby.

The FBI is investigating at least one suspected improvised explosive device found at the scene of what is being called an act of terrorism.

Sheriff Kevin McMahill of the Las Vegas Police Department said officials were "well aware of what happened in New Orleans", referring to the attack that included improvised explosive devices found near the scene in Louisiana.

FBI Special Agent Althea Duncan, who is leading the investigation, said an improvised explosive device was found at the scene and they were working on confirming whether it was "viable".