A group of military officials from Libya has visited the site near Turkish capital, Ankara, where a plane crashed on Tuesday, killing Libyan Chief of General Staff General Mohamed Ali Al-Haddad alongside his delegation and three crew members.

The Libyan officials arrived in Ankara on Wednesday and travelled to Kesikkavak in Ankara’s Haymana district, where the jet went down, killing everyone on board.

The delegation then proceeded to the area where the wreckage is located, where search and investigation efforts are ongoing.

The black box and cockpit voice recorder of the plane were recovered early Wednesday, Turkish Interior Minister Ali Yerlikaya said, adding that the wreckage is spread out over an area of roughly 3 square kilometers (about 1.16 square miles).

Examination and evaluation of the devices – which should help determine the cause of the crash – has begun, Yerlikaya said.

Over 400 personnel have been working at the scene with 103 ground vehicles and seven air vehicles, he added.

A 22-member Libyan delegation – including five relatives of the victims, defence ministry representatives, and officials from the Interior Ministry – also arrived in Ankara, Yerlikaya said.

“We are also very curious about (the cause of the crash), but this data will reveal the cause, and the authorities will share the findings with you,” he said.

The Falcon 50-type business jet crashed after taking off from Ankara’s Esenboga Airport en route to Tripoli, the Libyan capital.