MH370: the search must go on and all possibilities should be explored

Every twist in the mystery of missing Malaysia Airlines Flight MH370 is painful for the relatives of the 239 people who were on board.
The conclusion last week of French investigators that the piece of an aircraft's wing found washed up on the Indian Ocean island of Reunion in July is indeed from the plane brings back emotions that make moving on difficult.
That it is all that has been found after 18 months of searching provides not answers, but more questions. The agony is likely to end only when there is unequivocal proof of what happened.
A part of a wing does not provide that; it hints at, but does not prove, that the Boeing-777 crashed into the sea.
Only if more substantial wreckage is found will that be confirmed and, so far, a search of 60,000 sq km of the southern Indian Ocean off Western Australia has turned up nothing.
Before the find, there had been talk of scaling back the scouring of the sea bed and pressure within Australia and Malaysia, which are financing the operation, to reduce or even halt funding.