Australia mourns with US over 'shocking' Las Vegas attack: Turnbull

Malcolm Turnbull says Australia remains vigilant in maintaining its strict gun laws following the "shocking and senseless" shooting in Las Vegas.

Combination image of Malcolm Turnbull and police at the scene Source: AAP

The prime minister offered his prayers to the families of the more than 50 victims and wished the 500-plus injured a swift recovery.

"We stand with you and we mourn with you in this difficult time," Mr Turnbull told a maritime defence conference in Sydney on Tuesday.

"This was a cruel and callous attack on innocent people at a concert."

It was the worst mass shooting in America's history at the hands of 64-year-old Stephen Paddock."

This is a reminder that we must constantly work to stay ahead of the threat - whether the motives of those who seek to do us harm," Mr Turnbull said.