'The IAF has flown more than 100 hours in search operations. No effort is being spared to locate the missing aircraft,' the statement added.
The Indian Air Force had on Thursday said all 13 people on board the aircraft have died.
During the violence, a mob torched a shop, a house and damaged at least five vehicles, besides injuring a senior police officer, they said.
This hill town has been in grip of violence since Thursday after a fight between residents of Shillong's Punjabi Line area and Khasi drivers of state-run buses.