New Zealanders have described the terror and chaos as a gunman began shooting people at a concert in Las Vegas.

Glenn Read and Shena Parks, of Waihi, were about 500m away when the shooting began.

``We were about to do a helicopter ride over Las Vegas when people started running through the front door panicking,'' Mr Read said.

``One was shot in the arm. It was crazy.

``Everyone was put in a locked helicopter hangar but no-one was listening and just panicking.''

Ben Northrop, of Wellington, and business partner Callum Macleod had just arrived in Las Vegas for a conference.

``We literally drove down the strip, never been here before, and it all teed off in front of us.

``The first sign of trouble was people running towards us and police heading away.

``We talked to a woman and the woman next to her had been shot in the head.''

He said he was ``just down the road from the Mandalay'' and could see people covered in blood who had fled from the shooting.

``I can't believe how crazy it was.

``The guy beside me has got blood on him from other victims.''

A spokesman for New Zealand's Ministry of Foreign Affairs and Trade said there were 44 New Zealanders registered on SafeTravel as being in Las Vegas.

``There are no indications at this stage that any New Zealanders have been caught up in the incident,'' he said.