Authorities in India have launched an investigation after a group of migrant workers were filmed being doused in a "chemical solution" by officials. They are believed to be migrants who returned to the city of Bareilly, in the northern state of Uttar Pradesh. Millions have returned to their home villages amid a nationwide, three-week lockdown because of the coronavirus pandemic. But our Delhi correspondent Murali Krishnan told Annemarie Evans many have been left completely stranded: