Friend went missing hiking in Ticino

Kind of a desperation play at this stage. A friend of mine has gone missing while hiking in Ticino. There were some news alerts published on Monday but nothing since

https://www.cdt.ch/news/si-cerca-chieu-vu-nguyen-355547
https://www.blick.ch/schweiz/tessin/wo-ist-die-us-amerikanerin-chieu-vu-nguyen-im-tessin-verschwunden-id19855182.html
https://www.tio.ch/ticino/cronaca/1763318/la-polizia-cantonale-e-alla-ricerca-di-chieu-vu-nguyen
https://findchieu.wordpress.com/

Attempts to contact relevant authorities for more info has not really worked, but maybe some of that is because we just aren’t familiar with the Swiss system.

Looking for advice on anyone that we should be contacting, or really any advice at all

Thanks r/switzerland