As of now it's the normal building security crew, just a couple more guys on the clock than usual at any given time. & the elevators/stair wells usually only lock after hours, but are currently locked down full-time. Just started today.
I've been downstairs a couple times & haven't noticed any higher foot traffic or anything. When I asked the security guard downstairs if there were any threats or anything, he just said "nothing I can speak about at this time". By the time I got upstairs after that, our admin team had sent out an email about the increased security measures & specifically cited 'Due to threats made against the DSM Register'.
Of course any threats should be reported/investigated, but I'm not exactly in fear for my safety over this. If police/other agencies start to get involved, maybe (or at the very least state my case to work from home..)