OK, a kid of obvious ME descent, named AHMED MOHAMMED builds a "clock" that looks like a bomb and brings it to school.
He gets arrested, because it looks like a bomb.
Racial profiling? Yep. But, I think that any kid who brought something like this to school these days would've had a problem. I don't see any explosive compounds in this picture, but how difficult would it really be? I had the knowledge at 14 to build explosive devices from commonly available products and that same knowledge is widely available via the internet now.
I would say this is a "Better safe than sorry" moment. Teachers don't generally know squat about bombs, better to leave it to a pro.
Kids being expelled for biting pop tarts into the shape of a gun is ludicrous, this is one time, as a parent, that I think they made the right call.
Even a blind squirrel finds a nut every now and again.