Israeli officials have said they do not think they will find any survivors in the wreckage of a helicopter that crashed in Romania on Monday night.
The six Israelis and one Romanian are still considered missing and a specialist team from Israel has arrived to help with the search and rescue effort.
But Brigadier General Relik Shafir said: "We have reason to believe that all seven crew are dead.
"It's been a black day for all of us."
Another Israeli air force spokesman, Brigadier General Avi Benayahu said: "It would have been very difficult to have come out of this incident alive.
He said the helicopter hit the mountaintop, rolled downwards and then burst into flames.
The CH-53 helicopter was on an aviation training exercise training when it ran into poor weather conditions, although this has not been confirmed as the cause of the crash.
A list of the missing crew members has been released. They range in age from 24 to 48.
The Romanian and Israeli air forces have launched a combined investigation into the disaster.