India has temporarily blocked the Telegram app over concerns it may be used for cheating, days before a crucial medical entrance exam is set to be reheld. Millions of students will retake the National Eligibility cum Entrance Test - Undergraduate (NEET-UG) on 21 June after the exam held in May was cancelled over allegations of a paper leak. The National Testing Agency (NTA), which conducts the exam, welcomed the move, saying that it was taken in response to the "organised use of the platform [