The owner of the SUV has officially came out and has confirmed in a statement that he installed some aftermarket third-party accessories from a dealership and their faulty functioning was probably the cause of his MG Hector getting caught on fire. The brand has contacted the owner of the car the same day while has ensured that all the passengers present inside the car are safe. The owner appreciates the high level of customer service issued by the brand personally for that matter.
You can read more about the official details here - https://news.maxabout.com/cars/mg-motors/mg-hector-caught-fire-delhi/