A massive fire broke out at the Karaj nuclear power plant in Iran on Thursday, according to reports by regime opposition activists cited in Israeli media on Thursday.

A massive fire broke out at the Karaj nuclear power plant in Iran on Thursday, according to reports by regime opposition activists cited in Israeli media on Thursday. Regime-affiliated Iranian media is reportedly silent as images of the fire emerge.

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Videos from the site surfaced on social media, showing plumes of thick black smoke billowing into the sky. 

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The exact cause behind the fire is yet to be ascertained.

More details awaited.