It found that the construction company had failed to fill the excavated trenches for laying the pipelines with stone quarry as per the standard procedure.

Six people, including two employees of Gammon India, were arrested last year.

In Delhi, five people were killed and 15 injured around 5 a.m. when a part of the elevated underconstruction Metro track came crashing down near Kailash Colony in south Delhi on the Central Secretariat-Badarpur section slated to open by September 2010 when the Commonwealth Games are to be hosted in the city.