Foreign Ministry spokesman says US is the main suspect unless proven otherwise, Tehran reserves right to take retaliatory action

Javad Karimi Qoddousi rules out a strike 'by an external object' as the cause of a fire that damaged an advanced centrifuge plant at Natanz

In interview with Israeli radio station, former US national security adviser says Trump motivated by domestic audience, Kushner worried about Israeli unilateral annexation

Witness says blaze takes place near or at Tabriz thermal power plant, but local media says site is cellophane factory; incident comes after morning blast at another power station

Power station located in same province as Natanz nuclear facility, which was damaged in July 2 blast blamed on Israel

Large fire rages at scene of incident in south of nation; no reports of casualties

American official tells CNN that Iranian forces responding to recent events, fears of threats to regime; follows string of mysteries fires and explosions in Iran

Mysterious explosions unlikely to slow Tehran in growing its stockpile of low-enriched uranium, which had been curbed by nuclear deal that Trump abandoned

Blast said caused by gas cylinders, according to Iranian media; incident latest in series of mysterious occurrences in Iran

Blast at centrifuge assembly facility may have set back development by 2 years, experts tell the NY Times, with series of strikes causing 'extreme internal and external pressure'