Egyptian investigators have said they have found the main wreckage of EgyptAir flight MS 804 that crashed into the Mediterranean Sea on May 19 with 66 people on board. A deep ocean search vessel, contracted by Egypt, has identified several main locations where the plane’s wreckage was found, and provided the images to the search investigation committee.

The cause of the crash is still unknown. The Cairo-bound flight from Paris had disappeared off the radar before crashing, but had not sent out a distress signal. Investigators have not ruled out terrorism as a cause, though no terror outfit claimed the plane crash. Earlier, analysts said that evidence recovered pointed to an explosion on board before the plane went down.

The countries involved had stepped up searching for wreckage because signals from the flight’s black box were expected to die by June 24. The search area has been one of the deepest in the Mediterranean, the BBC said — it has covered more than 3,000 metres in some parts.