Jay Chandrasekhar will sound the sirens when directing “Ambulance Chasers” for Warner Bros. through his Broken Lizard comedy shingle. Jon Zack has been hired to pen the script.

Story revolves around what happens when two fiercely competitive personal-injury lawyers fight over a new client.

The Broken Lizard team, based on the Warners lot, consists of Chandrasekhar, Kevin Heffernan, Steve Lemme, Paul Soter and Erik Stolhanske. They inked their production deal with the studio last year after the box office success of “The Dukes of Hazzard,” which Chandrasekhar directed.

Zack, one of the writers on DreamWorks’ upcoming “Shrek the Third,” has sold several scripts around town, including “Seniors” for Focus Features and “Crazy Train,” a project set up at Fox. Previous credits include “The Perfect Score” and “Out Cold.”

“I first met Jon after reading his hilarious script ‘Crazy Train.’ He has an amazing ear for dialogue,” Chandrasekhar said.

First up in the Warners-Broken Lizard deal is the Chandrasekhar-helmed “Beerfest,” which is in post-production. As with their previous pics, “Super Troopers” and “Club Dread,” the comedy troupe’s members wrote “Beerfest” together and all star.