terrorism?
Anti racist math, affirmative action engineering or crony contract bidding would be my guess.
My first thought.
Stop it.
There is absolutely nothing pointing to terrorism.
99% likely poor construction. Rebar corrosion and concrete compression collapse.
The lawyers are circling. Wrongful death lawsuits. Some company will be declaring bankruptcy. Insurance company will take a major hit. Lawyers will take a 1/3.