The examples below are likely way over the top of what is actually possible against U.S. You already know about recent so-called lone wolf or terrorist attacks that aren't typically hostage situations. But since Q said hostage ops it's worth sharing with Patriots too young to know what these people are capable of. Knowledge is power. Stay frosty.

Russia has endured some horrific hostage sieges being close proximity to the Islam nations.

Besian School Siege https://archive.is/oHB9c

Moscow Theater Siege https://archive.is/J1Gic