(Assuming you are referring to last night's incident, not the 2016 one.) No, I wouldn't completely discard it. Nor would I limit sabotage scenarios to stealth

(Assuming you are referring to last night's incident, not the 2016 one.) No, I wouldn't completely discard it. Nor would I limit sabotage scenarios to stealthy snipers. It could be anything from a suicidal pyromaniac with a hammer to a hacker messing with engine control software and prediction markets, to a nation-state actor.