That seems plausible. Unless a true wackdoodle, you would think the loudspeaker message would have included the supposed motivations though. A 15 minute countdown? Maybe it did and it just isn’t done filtering through to actual public news yet.
Freegards
Sounds like a personal beef to me, not domestic or foreign terrorism in the strict sense.
Wanted to destroy a specific building/area due to a grudge or grievance. Sort of like the guy who took a bulldozer to his town a few years back and wreaked property damage.