You may recall the "No Russian" mission in Modern Warfare 2 kicked up a bit of a kerfuffle. While you didn't have to gun down civilians, you could, and that didn't sit well with some people. EA may have found a way to top that moral ambiguity in Battlefield 3, as outed by the Electronic Software Ratings Board (ESRB).
Be warned, this may contain Battlefield 3 campaign spoilers.
The ESRB rating (via Eurogamer) suggests killing in cold blood while a character is restrained, and shooting at police officers to complete a mission objective. Gunning down cops is generally the hyperbolic thing that uninformed pundits say about video games. We're not sure of the context in Battlefield 3, but you can almost smell the controversy boiling already.
In response, EA has issued a statement to Eurogamer, though we can't imagine the attempt at humor will sate anyone who's offended. "I don't think you understand the gravity of the situation. For God's sake, there is a nuke in Paris! Millions of lives are at stake!!"