Watch | Delhi cops turn Hindi teachers for colleagues from North East

Armed with books for third standard students, a group of 12 Delhi Police subinspectors meet at the police library every Sunday to take Hindi lessons. While they wait in the classroom, assistant sub inspector Jai Singh walks into the class exactly at 11 am carrying a set of test papers, the 12 officers wrote a week ago. Singh is a rank junior to all of them but in the class they call him 'sir'.

The officers, all from the northeastern states, joined the police force in 2015 and realised they had to be fluent in Hindi. They met joint commissioner Robin Hibu, who heads the Delhi Police special unit for northeast, and requested for Hindi lessons. Since August, for three hours every Sunday, Singh has been teaching them the language.