unless you know the exact apartment it came from or are that worried, i wouldn't call the cops...

just stay away from the windows and defiantely don't go standing outside to see what's going on lol...

i hear gun shots all the time around here.... most of the time it's just people shooting 'em off cuz they're drunk or it's new years or w/e... only once (out of thousands) has anyone been shot.. and the cops were in here in a matter of minutes...