Perhaps there was a rumor of a laser being painted on top of the building?
Moscow or Tehran has been tipped off that a US or Israeli attack is imminent on the Bushehr plant and Iran’s other nuclear installations and acted to whip Russian personnel out of harm’s way.
This would be good news.
just make sure AmadJihad is taking a Tour of the reactor..
and he survives for 2-3 days......like a Microwaved Chicken.