INDIA has blocked the airing of a BBC documentary which questioned Prime Minister Narendra Modi's leadership during the 2002 Gujarat riots, saying that even sharing of any clips via social media is barred. Directions to block the clips from being shared have been issued using emergency powers available to the government under the country's information technology rules, said Kanchan Gupta, an adviser to the government, on his Twitter handle on Saturday. While the BBC has not aired the documentary in India, the video was uploaded on some YouTube channels, Gupta said. The government has issued orders to Twitter to block…