A worker pours liquid paraffin wax in small iron boxes to make candles, which are used to decorate temples and homes during the Hindu festival of Diwali, at a workshop in Kolkata, India October 10, 2017.

A woman colours earthen lamps which are used to decorate temples and homes during the Hindu festival of Diwali, in Mumbai, India, October 11, 2017.

A woman colours earthen lamps which are used to decorate temples and homes during the Hindu festival of Diwali, in Kolkata, India October 12, 2017.

Dancers perform a traditional Indian dance during the Diwali festival of light celebrations, in Trafalgar Square, central London, Britain October 15, 2017.

People fill the street during the Diwali lights switch on in Leicester, Britain October 8, 2017.

Fireworks fill the sky during the Diwali lights switch on in Leicester, Britain October 8, 2017. Reuters/Darren Staples

A vendor hangs lanterns for sale at a roadside market ahead of the Hindu festival of Diwali in Mumbai, India, October 17, 2017.

Image used for illustrative purposes. Vendors show lanterns to customers at a roadside market ahead of the Hindu festival of Diwali in Mumbai, India, October 17, 2017. Reuters/Danish Siddiqui

A woman decorates her house on the eve of the Hindu festival of Diwali in a slum in Mumbai, India, October 18, 2017.

A devotee lights oil lamps at a religious ceremony during the Diwali or Deepavali festival at a Hindu temple in Colombo, Sri Lanka October 18, 2017. Reuters/Dinuka Liyanawatte. Image used for illustrative purpose.

A devotee lights oil lamps at a religious ceremony during the Diwali or Deepavali festival at a Hindu temple in Colombo, Sri Lanka October 18, 2017. REUTERS/Dinuka Liyanawatte

People light lamps as they make a formation of a peace symbol on the eve of Diwali, the Hindu festival of lights, in Chandigarh, India, October 18, 2017.

A man puts lights in an alley the eve of the Hindu festival of Diwali in a slum in Mumbai, India, October 18, 2017.

A girl plays with firecracker on the eve of the Hindu festival of Diwali in a slum in Mumbai, India, October 18, 2017.

A woman colours earthen lamps which are used to decorate temples and homes during the Hindu festival of Diwali, in Kolkata, India October 12, 2017.

A man arranges earthen lamps in a furnace, which are used to decorate temples and homes during the Hindu festival of Diwali, in Mumbai, India, October 11, 2017.

An artisan rests next to the earthen lamps, which are used to decorate temples and homes during the Hindu festival of Diwali, at a workshop in Chandigarh, India, October 15, 2017.

A man makes earthen lamps which are used to decorate temples and homes during the Hindu festival of Diwali, at a workshop in Ahmedabad, India October 10, 2017.

Dancers perform a traditional Indian dance during the Diwali festival of light celebrations, in Trafalgar Square, central London, Britain October 15, 2017.

Image used for illustrative purpose. Hindu priests put the finishing touches to a rangoli, or mural made out of coloured powders, at a temple ahead of Diwali festival celebrations in Ahmedabad, India, October 17, 2017.

A woman picks marigold flowers used to make garlands and offer prayers, before selling them to the market for the Tihar festival, also called Diwali, in Kathmandu, Nepal October 17, 2017.

A woman unloads marigold flowers used to make garlands and offer prayers, before selling them to the market for the Tihar festival, also called Diwali, in Kathmandu, Nepal October 17, 2017.