The cause continues to evade easy explanation.
An investigation into the cause continues and those employed by the regulator are properly mindful of the risk of being seen to prejudge matters.
All 170 people on board escaped unhurt, apart from some minor injuries from exit slides, and an investigation into the cause continues.
As the movement to end police violence has raged over the past few years, even as the drumbeat of police violence goes on, faces co-opted as symbols for the cause continue to spring up: Mike Brown, Sandra Bland, Tamir Rice.
"There'll be more to say about this and what it means for Scotland in the days to come but for me personally and for the Scottish Labour party the fight goes on and the cause continues".
The three companies involved have been passing the blame to each other during the last several weeks as investigations into the cause continue.
Doubts about the causes continue to spark controversy.
The Spanish cause continued to inspire the Left Book Club even when, in 1938, the Aragon front began to collapse and it became clear that the nationalists were winning.
New York City's support for the Union cause continued, however grudgingly, and gradually Southern sympathies declined in the city.
But the precise cause continued to elude researchers.
