Queensland Premier Campbell Newman's mobile phone number and home address have been published on a social media site, together with his wife Lisa's phone number.
The security breach follows threats by hacktivist group Anonymous saying the premier's campaign against outlaw motorcycle gangs had gone too far.
The leaked personal details were published on a site linked to motorcycle groups in Australia, sparking safety fears among the premier's family, reports Fairfax Media, which elected not to name the website.
The Newman family reportedly received a number of "upsetting" prank phone calls since the details were published at the weekend.
A spokesman for Mr Newman said the security breach was "concerning and regrettable"
"It is particularly distasteful given it involves the Premier's family," the spokesman said.
Last Thursday the Australian branch of Anonymous posted an online video saying Mr Newman's new anti-bikie laws, which apply mandatory sentences for members of organisations the government deems as criminal, impinged on civil liberties and represented "creeping fascism".
The group warned Mr Newman to "expect us".
Police are now looking into the video.
Mr Newman meanwhile has vowed to continue his war on bikies.
Source: Brisbane Times
Author: Martin Zavan, Approving editor: Erin Tennant