JAKARTA, Dec. 28  -- An Indonesian senior official said on Sunday that vessels and plane have been sent to locations allegedly being the places where the AirAsia plane had lost contact with Indonesia's Air Traffic Control (ATC).

Speaking at a press conference held in Jakarta airport, Djoko Murjatmodjo, director general of air transport at the Transportation Ministry, said a plane from national calibration agency and several vessels from national search and rescue agency (Basarnas) have been deployed to undertake surveillance on the suspected locations.

Djoko said the commercial plane that departed from Indonesia's Surabaya city to Singapore was officially declared to have lost its contact with the ATC on 6:17 a.m. western Indonesian time (WIB) , or one hour after taking off from Surabaya.

"Our final assumption is that the plane has lost contact. The location of lost contact was estimated between Tanjung Pandan and Pontianak," Djoko said in the event televised nationwide, referring to the largest cities in Indonesia's territory near Singapore.

The surveillance would be conducted in waters between Tanjung Pandan in Bangka Belitung regency and Pontianak, West Kalimantan province.

Djoko said the AirAsia plane was boarded by 155 passengers, comprised of 138 adults, 16 children and 1 infant. With the plane crew included, total people onboard were 162 ones.