Indian Prime Minister Narendra Modi praised Tata as "a visionary business leader", saying he's "extremely pained" by the death. Tata ran the conglomerate for over20 years as chairman.

Tributes are pouring in following the news of Ratan Tata's death, but many want to know what the former business leader's cause of death was.

Hundreds of people, including corporate leaders, politicians and celebrities, gathered in Mumbai on Thursday to pay their last respects to one of India's most respected business tycoons, Ratan Tata, who died aged 86.