YHU is one of the busiest GA airports in the country. They do an awesome job dealing with all the foreign pilots that go through the flight schools there. This is truly a sad turn of events for the folks there and I feel for the victims and their families.
I was working at my tower when this happened, and having seen the replay of the radar footage, my heart sank when I saw both planes merging and disappearing from radar....
I obviously cannot comment on the situation any further, but what we know, according to the following article (among others)...
2 Chinese pilots, 21 and 23 years old, each on a solo flight, one with 40 hours, the other with 140 hours experience.
One of the pilots did not respond to four attempts to contact him. The planes crashed after one of the pilots inexplicably changed altitude.
Sad, sad turn of events, that will scar all the people involved (families, pilots and controllers) for the rest of their lives.