vmandr's link is to the official website of the Greek CAA , think it is helpful to put the full text here:
19 MAY2016 EGYPTAIR FLIGHT MSR 804 - HELLENIC REPUBLIC - MINISTRY OF INFRASTRUCTURE, TRANSPORT AND NETWORKS - CIVIL AVIATION AUTHORITY GOVERNOR Athens, May 19, 2016 PRESS RELEASE
SUBJECT: EGYPTAIR FLIGHT MSR 804
Egypt Air flight MSR 804, A320 en route from Paris to Cairo entered ATHINAI FIR at 02:24 am local time. It was Radar identified and cleared by the competent Air Traffic Controller for the flight path.
At 02:48 am local time, the flight was transferred to the next Area Control Center Sector and was cleared by the ATC for the exit point of ATHINAI FIR. The pilot was jocund and thanked in Greek.
At 03:27 am local time, ATHINAI Area Control Center tried to communicate with the flight for transfer of communication and control from ATHINAI FIR to CAIRO FIR.
Despite the repetitive calls, the flight did not respond and thus the Air Traffic Controller called on the emergency frequency without response.
At 03:29 am local time the flight was over the boundary point, between ATHINAI and CAIRO FIRs.
At 03:29:40 am local time the flight signal was lost from radar, almost 7 NM south/southeast from KUMBI point (boundary point, between ATHINAI and CAIRO FIRs), within Cairo FIR.
Immediate assistance of the Hellenic Air Force radars was requested for possible target tracking, with no avail.
At 03:45 am local time Search and Rescue (SAR) operations were activated through JRCC (Joint Rescue Coordination Center), NAOP (National Air Operations Center) and ADIC (Air Defense Information Center),while updating the Egyptian Civil Aviation Authorities.