They said they could not speculate on the possible cause.
But he declined to give details on the possible cause.
There is various speculation as to the possible cause.
Officials said investigations are ongoing and refused to speculate on the possible cause of the accident.
It is emerging that friendly fire was the possible cause of two of the deaths.
In a statement to the news media, DHL said it would not speculate on the possible cause of the accident.
Plenty of conspiracy theories about the possible cause of the power problem have been aired since the incident.
Si, D., Ding, Y. & Liu, Y. Decadal northward shift of the Meiyu belt and the possible cause.
This evening officials reported a series of findings that gave a first impression of the possible cause.
But no one involved — the investigators, Boeing, the airline or the airport — commented on the possible cause of the fire.
Further, the possible cause for the decrease in efficiency with decrease in CdTe film thickness is discussed in this article.
