The final investigation report was released on 6 May 2010.
The final investigation report was published on 14 September 2011.
An investigation report in the needs of the senior citizens living there.
"But at the same time, we wanted to address issues raised by the special commissioner of investigation report."
Early investigation reports did not indicate consensus over the cause.
By January 2013 the technical investigation report had not yet been released.
The investigation report into the crash was released on December 13, 2010.
According to the investigation report, a lack of critical information had caused the confusion.
It studied the files of more than 50 research subjects and found problems in almost every one, according to its investigation report.
They were "not capable of detached analysis," he said, according to the investigation report.