Relatives of passengers on board the missing Malaysia Airlines (MAS) flight MH370 have been told that there is sealed evidence that cannot be made public.
The sealed evidence reportedly includes the air traffic control radio transcript, the radar data and airport security recordings.
The briefing at the Metropark Lido Hotel in Beijing focused on UK satellite analysis which led Malaysia to conclude that flight MH370 ended in south Indian Ocean, off Perth.
During the question-and-answer session, a relative said: "Thanks for demonstrating your ability to read every word out of the powerpoint slides."
Another asked: "If the info is from UK satellite firm Inmarsat, does it mean the Malaysia team cannot answer our questions on the MH370 analysis?"
Faced with the barrage of questions from the angry relatives, the MAS team replied: "We can answer but we might not be correct as we're not the investigators".
They also added that search and rescue operations for the plane have been stepped up - but that, as the search area is so huge, it will take a lot longer than previously expected.
The Malaysian government and MAS have been criticised for their handling of the disappearance of MH370 - particularly over the fact that they were slow in revealing details about the incident.
Based on latest UK data analysis, the plane had gone down in a remote part of the southern Indian Ocean.
However, at the briefing, one relative said: "We demand you retract announcement that MH370 ended in south Indian Ocean and continue search-and-rescue operations."
Some family representatives also targeted Malaysian envoy Iskandar Sarudin, asking him: "You expect us to accept a report you cannot defend?"
"No comment," he replied.
He again issued a flat "no comment" when asked "how do you expect us to feel friendly towards Malaysia?"
Understandably upset, one relative said: "You have once again left us speechless!"
The search for missing Malaysia Airlines Flight MH370 continues.