Chennai , Oct 18 (ANI): People thronged markets in Chennai city of Tamil Nadu to buy 3D firecrackers ahead of Hindu festival of lights, Diwali.Diwali is celebrated with great fervour and gaiety all over India as it marks the return of Hindu Lord Rama to Ayodhya after he defeated Ravana, the powerful king of Lanka.Devotees decorate their homes with oil and electric lamps welcoming Lord Rama. They also celebrate by bursting firecrackers at homes with family and friends.A mass firecrackers sale has been organised in Chennai by Tamil Nadu Traders Association. There are about 120 shops selling variety of firecrackers. Joint secretary of Tamil Nadu Traders Association, Abdul Rehman said for children, 3D firecrackers were new in the market.