Input Tax Reversal on fire

CA OM PRAKASH GUPTA (CA Practice ) (75 Points)

15 November 2021  
In a manufacturing unit there is a major fire and entire factory is fade away.

Is there any statutory requirement to intimate GST department ??

Is my understanding correct that we have to reverse the GST on stock and plant & machinery that is burned in fire ??
What will be impact of GST when insurance claim received.