Contact your BILs tell then you can't get in touch with the boys. No answer on the home phone or anybody's cell phone. Put it in a e-mail so it is documented. Let them know you are concerned about their safety. Make it very business like.
This isn't permanent. That's pessimisic thinking. Fireworks are for entertainment, you will head home focused on solutions.
M22,H45,W45 S21/18D12 Retain faith that you will prevail in the end, regardless of the difficulties and at the same time confront the most brutal facts of your current reality, whatever they might be.
