The Biggest Stories of May 12, 2016

"Was referring to lobbying not bribes but I did say Sonia Gandhi was the driving force," middleman Christian Michel tells NDTV; Delhi is no longer the world's most polluted city reveals the latest air quality report released by the WHO but India is still home to four of the five worst cities; 29 Indians stranded in Libya return as a political battle breaks out on who should claim credit; Kumar Vishwas's song for AAP's Punjab campaign goes viral; and more in our news wrap of the day.