Indias top court ruled that authorities must regulate the sale of acid. The Supreme Courts ruling on 16 July 2013, came after an incident in which four sisters suffered severe burns after being attacked with acid by two men on a motorbike. Acid which is designed to clean rusted tools is often used in the attacks can be bought across the counter. But the judges said the buyer of such acids should in future have to provide a photo identity card to any retailer when they make a purchase. The retailers must register the name and address of the buyer. In 2013, section 326 A of Indian Penal Code was enacted by the Indian Parliament to ensure enhanced punishment for acid throwing.