WELL, GOOD: Report: Massive Explosion At Iranian Nuclear Facility. “According to ISNA the blast was so powerful it shattered windows up to 12 kilometers away and the glare from the explosion lit up the night sky.”

If I recall correctly, it takes about 1.5 psi overpressure to break a window. To get 1.5 psi overpressure at 12 kilometers — roughly 8 miles — takes an awfully big explosion.

UPDATE: Apparently I was off by a factor of 10 — I think it was 1.5 to shatter a window into dangerous projectiles — but still, a big boom. Waiting for confirmation.