They kept them on the plane?
I know that newspaper reports are still early, but at least one source (quoted upthread) implied that pax were kept on the plane for some time after landing.
I hope that this isn't the case: if passengers need to be debriefed, move them somewhere secure but off the plane. I'll hope it is just inaccurate reporting, but then back in the time of SARS I recall reports of pax being kept on a plane because one passenger appeared to be sick.
If someone is sick, being forced to stay near them for even a minute longer than is physically necessary (not on the ground yet) is cruel. The same holds true if one passenger attacks the others: keeping the victims on the plane itself seems horrifying to me.