Orissa, Feb. 23 -- National Disaster Response Force (NDRF) teams on Sunday intensified rescue efforts to save eight persons trapped in an under-construction tunnel after a portion of its roof collapsed in Telangana's Nagarkurnool district on February 22.

Four teams comprising 150 personnel were engaged in the rescue operation, which continued throughout the night.

The rescue teams have reached closer to the point where the tunnel roof collapsed during the digging work on Saturday.

At least two workers were injured and eight others were trapped when a portion of the tunnel being dug as part of Srisailam Left Bank Canal (SLBC) collapsed near Domalapenta.

A total of 50 workers were present in the left-side tunnel when the roof collapsed...