Patriot Missile Accidentally Fired?

How in the Hell do you accidentally fire a Patriot Missile?

A whole series of events have to take place before firing... target acquisition, tracking, double checking/confirmation of a target...more tracking, launch order from commander(s), etc. It's not a one button operation. There are certainly fail-safes on the Patriot. So this story doesn't exactly make sense to me.

This reminds me of the reported Israeli bombing raid in Syria a few weeks ago. We didn't find out what happened until several days later.