JAKARTA, Jan. 13 -- Final results of investigation on the crashed AirAsia QZ 8501 will be published at least one year later, an Indonesian official said here on Tuesday.

"A final report containing all the results of the probe into the crash will be released one year later," Tatang Kurniadi, Chairman of Indonesian Transport Safety Committee, told a press conference in Pangkalan Bun city, central Kalimantan.

The formal investigation will commence after the release of a preliminary report, said Kurniadi, adding that the preliminary factual report, which has no analysis, will be released within one month.

Tatang Kurniadi said a draft of the final report will be delivered to countries including France, Singapore and United States for evaluation.