Sikkim Chief Minister Prem Singh Tamang has blamed "inferior construction" by the previous state government for the destruction of the Chungthang Dam - a 1200 MW hydroelectric project washed away Wednesday in flash floods triggered by a glacial lake outburst over South Lhonak Lake. Mr Tamang told NDTV "sub-standard" work by the earlier Sikkim Democratic Front government, which was in power for over 24 years, is to blame for a tragedy that has claimed 19 lives so far.