Know how Yamuna expressway turning into a deadly highway

"We were all in deep sleep when the bus toppled twice before falling in the nallah (drain). Screams were heard for about a minute after which there was silence. Some passengers climbed on top of bodies to make their way out of the bus," said Rishi Yadav, a survivor of the bus accident on the Expressway in which 30 people were reported killed on Monday morning.

Yadav, a resident of Barabanki, is currently undergoing treatment at Agra's Sri Krishna Hospital.