It will be incredibly incompetently pulled off. There'll be a car bomb that will only result in the car catching fire because it turns out gasoline isn't actually that explosive, or the bomb will detonate at midnight rather than midday because they don't understand 24-hour clocks, it will not work at all because they got the instructions from Grok.

They might just fake a bio weapons attack but the big problem with that is once it's proven that it's a fraud there won't be any justification anymore. So they will need to do some actual damage to something.