Stars such as Cameron Diaz, Justin Timberlake, Halle Berry and Lindsay Lohan are mounting a campaign against paparazzi.

With the help of the Los Angeles Police Department, the celebrities are aiming to curb the behaviour of "aggressive" paparrazzi who "overstep the mark," such as Gaio Ramirez, who allegedly ploughed into Lindsay Lohan's vehicle for the sake of taking photographs.

The Los Angeles Times reports: "The investigation centers on whether celebrity photographers are being instructed on how to obscure their identities, block license plates, appear in the same place at the same time, or work together to force celebrities off the road and out of their vehicles."

However, the campaign also seems to have a zero tolerance approach towards photographers aiming to report on their cause. Lohan and Diaz were none too impressed when photographers turned up to publicise a press conference held at the Beverly Hills Hilton over the weekend, reports MRIB.

Lohan's publicist complained: "It's a complete lack of respect. These celebrities are just like you and me, and they deserve to have their privacy."

Meanwhile, Diaz lamented: "It's a sad day for celebrities when they can't hold a news conference without being harassed by photographers."