Cops say it's practically "impossible" to determine who defaced the advertisement

By Matthew Cole Weiss
Updated January 19, 2015 05:50 PM
Credit: Keith Bernstein/Warner Bros. Entertainment Inc.

The backlash from the new Bradley Cooper film American Sniper continued Sunday when a billboard in Los Angeles was tagged with the word ‘murder’ in spray paint.

Cops say no crime report has been filed yet, but if or when it does get reported, it will be virtually impossible to find out who is responsible.

“Taggers like to throw up their own stuff,” LAPD Sgt. A. Bone tells PEOPLE. “If it’s just the word ‘murder’ there’s practically no way to track it down.”

This is just the latest attack on the Clint Eastwood-directed film, which tells the story of Navy SEAL Chris Kyle, known as the deadliest sniper in U.S. history.

Outspoken filmmaker Michael Moore Tweeted on Sunday, “My uncle killed by sniper in WW2. We were taught snipers were cowards. Will shoot u in the back. Snipers aren’t heroes. And invaders r worse.”

Seth Rogen also commented via Twitter, comparing American Sniper to Nazi-like propaganda footage found in the film Inglourious Basterds – though he later clarified his remarks.

So far, these reactions have yet to affect the film’s success, as it grossed over $105 million dollars this weekend and received six Oscar nominations.