One member of air crew has died and two others remain unaccounted for after two Tornado jets crashed off the coast of Scotland on Tuesday, the Ministry of Defence (MoD) said.
The man who died was an officer from 15 (Reserve) Squadron, based at RAF Lossiemouth in Moray.
A fourth crew member is in a serious but stable condition in hospital. There is "no expectation" of recovering the missing people alive, said Group Captain Ian Gale, the station commander at the RAF base
The name of the officer who died has not yet been released.
Mr Gale said Wednesday's decision not to resume the search and rescue operation for the missing crew was due to "extremely poor" weather conditions in the area. The recovery operation will resume as soon as possible. Mr Gale said the incident will be subject to a full investigation.
He said in a statement: "Following the incident involving two of our Tornado GR4 aircraft in the Moray Firth yesterday, it is with great sadness that I must confirm the death of one of the crew members, an officer from 15 (Reserve) Squadron, based here at RAF Lossiemouth.
"A second crew member remains under medical care, where he is in a serious but stable condition. Two additional personnel remain unaccounted for. Due to extremely poor weather conditions in the area, the RAF and Her Majesty's Coastguard have made a joint decision not to resume search and rescue operations.
"The operation will be resumed as a recovery operation as soon as possible, but we must be realistic: given the length of time that has elapsed since the accident, there is no expectation of recovering missing personnel alive.
"The Royal Air Force is in contact with the next of kin of all those involved. As I am sure you will understand, they have asked for a period of time to take in the news and inform extended family members before further details are released. The Royal Air Force intend to respect this and I would ask the media to do likewise.
"Clearly, this incident will be subject to full investigation, and a service inquiry will be led by the Military Aviation Authority. It is important that we establish the facts of what happened and it is vital that the investigation is allowed to take its course. But the priority now is to ensure that the families of those involved receive the support they need at this most difficult of times."