New Delhi, June 12 -- The gas well blowout in Assam's Tinsukia district has polluted the Lohit river and adjoining eco-sensitive Maguri-Motapung wetland and toxic pollutants may have killed fish, insects as well as pose risk to endangered Gangetic dolphins in the region, a preliminary Wildlife Institute of India (WII) survey report has said. It has cited interviews with locals and said the Oil India Limited (OIL) did not have a mitigation plan for such accidents. WII has hence suggested a comprehensive impact assessment of entire OIL field operations in the biodiversity-rich area. The well caught fire on Tuesday days after the blowout, or leakage of gas and condensate, began on May 27. Dibru-Saikhowa Biosphere Reserve (DSBR) located nearby is home to endangered hoolock gibbons....