The Indian Air Force ordered a court of inquiry into the crash, hours after the debris of the fighter plane was sighted in an area 60 km from Tezpur airbase with which it lost radar and radio contact on Tuesday.
The Su-30 MKI jet had gone missing shortly after taking off from Tezpur Air Force station on a routine training sortie.
The identity of the missing pilots has not been disclosed and the worst is feared.
IAF officials said the wreckage was spotted from air and there will be clarity once the teams on the ground reach the crash site.
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Banerjee said the the teams will launch a search for pilots and the flight data recorder.
"The search parties of the Army are also trekking their way to the crash site. However, their progress is getting hampered due to inclement weather, thick foliage and steep terrain," he said.
"The weather has been inclement and the area has dense foliage. Therefore, search parties are taking time to reach the spot," he said.
The plane was part of a two-aircraft formation when it went missing.
The first batch of the Russia-made fighter jet was inducted by the IAF in the late 1990s. Since their induction, seven crashes have taken place.
At present, two squadrons comprising around 36 aircraft are deployed at Tezpur.