New 'Gunman' Trailer Exposes How Sean Penn Triggered a Humanitarian Catastrophe

The new international trailer for The Gunman gives more details on Sean Penn's sniper snafu. 

"We thought we were helping — it didn't work out that way," he explains in the latest trailer. "It's the biggest mistake I ever made."

Turns out that a job he was involved with has its own deadly repercussions — as one newsreel describes it, "The unclaimed assassination has triggered violent confrontations and a growing humanitarian catastrophe."

Adapting Jean-Patrick Manchette’s novel The Prone Gunman, the Pierre Morel film stars Penn as a former special forces soldier and military contractor suffering from post-traumatic stress who tries to get back with his long-time love, but first has to clear his name in a race across Europe.

The action thriller also features Javier Bardem, Idris Elba, Ray Winstone, Mark Rylance and Jasmine Trinca.

See more First Trailer for Sean Penn's 'The Gunman' Released

Open Road will release the film in the U.S. on March 20. Watch the new trailer above.