ts this movie that i have seen years ago, its english and is post 2000.
Now the movie takes place in road where a lot of people are being killed, also takes place in a police station where a male and a female are acting like FBI or whatever but they are the killers indeed.
In the end they kill everyone except a little girl.
Surveillance (2008)
https://www.imdb.com/title/tt0409345/