I saw several Beirut videos taken from car in which the shockwave knocked the rearview mirror loose from its socket. Why does that happen, when nothing else in the car - including windows - appears to be affected?

I have learned that, on preliminary information, the Beirut explosion should be rougly comparable to the 1947 explosion of 2100 metric tons of ammonium nitrate in Texas City, one of the worst industrial accidents in American history. Of course there have been many similar incidents in American history, some just a few years ago, but few at the scale of thousands of tons of material. PEPCON might have been altogether more explosive, but it was in an unpopulated area.

Did they really store thousands of tons of ammonium nitrate within a hundred meters of the entire country's primary grain silo? Makes for an iconic centerpiece to all the apocalyptic photos at least.