Billy Bob Thornton has joined the cast of the DreamWorks' Shia LaBeouf starrer Eagle Eye

Michelle Monaghan and Rosario Dawson have already signed on to the D.J. Caruso-directed thriller.

Written by Daniel McDermott, the story revolves around a slacker (LaBeouf) and a single mother (Monaghan) who are framed as terrorists and forced to become members of a cell with plans to carry out a political assassination. Hillary Seitz wrote the most recent draft.

Thornton will play a patriotic government employee who leads a homeland security team that tracks down the fugitives. Caruso created the role for the actor.