im looking for a video i seen years ago which as i remember it was footage from a militant assault on an FSB building in Dagestan (may have been somewhere else in the caucuses). If i had to guess i'd say it probably happened in the early 2000s. I included pic rel because i seem to remember it was a similar sort of video which included subtitled radio chatter. I seem to remember that some FSB officers were killed in the attack. It was quite intense footage. It seemed to have been filmed either by the FSB or some journalist.
I can't seem to find any articles about such attack but i remember reading about it after i seen the video.