LOS ANGELES – Celebrities have long contended with the occasional downsides of stardom – tabloid scandals, stalkers, box office bombs, the paparazzi. Now, add "swatting" to the list – a prank that sends police charging to the gates of stars' homes on false reports of gunmen, hostages or other crimes in progress.

Instead of bad guys, responding officers, police dogs, helicopters and sometimes SWAT teams have found only stunned domestic and security staff unaware of any trouble – because there wasn't any.

The recent hoax 911 calls to the homes of Tom Cruise, Justin Bieber, Ashton Kutcher, Chris Brown and other stars are leading authorities to eye some 911 calls with extra suspicion and lawmakers to call for stiffer penalties for the pranksters.