Mussoorie: Three pilgrims have died and a dozen received injuries due to falling rocks and boulders on the Sonprayag-Kedarnath route, disaster management officials in Uttarakhand said on Thursday. At Kedarnath, one person was killed and three injured when rocks fell on pilgrims between Sonprayag and Gaurikund while they were returning from Kedarnath shrine in Rudraprayag district on Thursday, the officials …