Iran says it would strike Israel's Dimona nuclear facility if its own nuclear site at Picakaxe Mountain comes under attack. The threat was declared on Friday by an Iranian member of parliament. Dimona, in the Negev desert, is the heart of Israel's unacknowledged nuclear program. Framing the warning around one named site gives the message more bite than a general statement of deterrence. Iran has issued retaliatory warnings of this kind before, naming Israeli targets in response to threats against its own facilities. Neither side confirms much about its nuclear sites, so the exchange leaves both programs wrapped in ambiguity. Striking any nuclear installation would carry consequences that neither government can fully predict.