Jean and Mat Holmes, of Hawke's Bay, were horrified to learn of the shooting while watching TV last night.
Their daughter, Rosemarie, and husband, Adrian Park, were holidaying with friends from Waihi in Las Vegas.
Jean Holmes said her daughter is traumatised, as she was standing opposite the Mandalay listening to the concert when the shooting happened. The sight of injured people being stretchered past her were too much, she said.
"The last I heard Rosemarie was very, very upset because of what she saw."
She said police surrounded them and put them into groups.