Iran's air defence at '100 percent op capacity' after blasts, reports Iran media

Israel's defence minister announced a preemptive strike against Iran early Friday following which Iran's air defence has been activated at full capacity.

Iran's air defence was activated Friday morning at full capacity, state TV reported, after a series of blasts were heard in Tehran.

Israel's defence minister said early Friday that the country had conducted a "preemptive strike against Iran".(AP)

"Iran's air defence says it is at 100 percent operational capacity," state TV reported, adding the reason behind the blasts remains unknown.

Israel's defence minister Israel Katz said early Friday that the country had conducted a "preemptive strike against Iran".