An aircraft of Vietnam Air Force has disappeared during a training season off the central coast on Tuesday morning.
The latest statement from military officers said the Sukhoi fighter jet Su-30MK2 went off the radar at around 7:30 a.m. with two experienced pilots, Tran Quang Khai and Nguyen Huu Cuong, onboard.
Dozens of officers and many fishing boats have been deployed to the area to look for the plane.
Officials are also checking information from a fisherman who said he saw a plane crashing into the sea at 8:30 a.m., around four to six sea miles to the east of the Mat Island, which is 20 sea miles offshore.
A search and rescue team has been set up on the island.
Su-30MK2 is manufactured by Russia and can be used for training, patrol or attack purposes.
The model of 22 meters long with a wingspan of 14.7 meters is also being used in China, Indonesia, Uganda and Venezuela.
Vietnam in January 2009 signed a $500 million contract to buy eight Sukhoi jets from Russia, and has ordered another 32. The first four aircraft arrived in Vietnam in June 2011.