India starts huge vaccine drive after emergency approval

India has kicked off one of the world's largest coronavirus vaccination drives as the pandemic spread at a record pace and global Covid-19 deaths surged past two million. India, home to 1.3 billion people, has the world's second-largest caseload. The government has given approvals to two vaccines -- though one is yet to complete clinical trials -- aiming to inoculate around 300 million people by July.