ANKARA, Dec. 24 (Xinhua) -- A Libyan delegation has arrived in Ankara to follow up on investigations into the crash of a private jet which killed senior Libyan military officials, Turkish media reported Wednesday.

According to the local daily Sabah, the delegation is gathering information from Turkish authorities at the crash site and following both the technical and judicial investigation processes.

Turkish Justice Minister Yilmaz Tunc said Tuesday evening that the Ankara Chief Public Prosecutor's Office had launched a formal investigation into the incident, which occurred in the Haymana district of Ankara province. The jet crash killed all eight people on board, including Libya's army chief of staff, Mohammed al-Haddad.

Turkish Interior Minister Ali Yerlikaya said on Wednesday that the aircraft's black box had been recovered and that the debris field extended over an area of approximately three square kilometers.

The aircraft, with tail number 9H-DFJ, departed Ankara's Esenboga Airport at 20:10 local time (1710 GMT) bound for Tripoli. Contact was lost at 20:52 (1752 GMT), shortly after the crew issued an emergency landing notification near Haymana. The jet was carrying five members of a Libyan military delegation and three crew members.

The Libyan officials led by al-Haddad had been in the Turkish capital for high-level military talks and met with Turkish Defense Minister Yasar Guler and other senior Turkish defense officials earlier on Tuesday. ■