Las Vegas - Police say a mannequin dangling from a hangman's noose on a Las Vegas billboard with the words “Dying for Work” was a publicity stunt.

Nevada Highway Patrol Trooper Jeremie Elliott says emergency calls started coming in early on Wednesday from drivers worried that the dummy was a real person.

The black billboard featured the words “Dying for Work” in white lettering, with a hanging, dark-suited mannequin.

A woman who answered the phone at Lamar Advertising says the sign was not authorised and was being removed. She did not provide her name.

Elliott says it's not clear who is responsible.

A similar billboard was reported in Las Vegas. That sign read “Hope You're Happy Wall Street” and featured another dummy. - Sapa-AP