This seems to be a newly developing trend for Chinese based stocks. Fear is a much more powerful emotion than greed. It can take years for a stock to build trust and only days for it to be lost. A group of hedge funds are using this and the lax naked shorting rules on our markets to take advantage of this. A few well placed rumors can be very profitable in a very short period of time. If you drive the share price low enough you can trigger debt covenants and possibly even bankrupt them before they can clear their name. If they go bankrupt the shorts don't even have to pay income tax on the gains because they never have to close the position.

SVM currently looks like it may be innocent.
TRE is a big question mark as nothing regarding the nature of the allegations has been made public yet.

Innocent or not may not matter as I suspect the hedge funds will continue their attacks and these companies will not be the last victims. There are no free markets just a rigged casino.