Was this problem started by “youths?”
Dungans is a Chinese Hui Muslim group of about 10 million people living mostly in China and about 100k between Kyrghystan and Uzbekistan. Some are illegal aliens living in that particular part of Kazakhstan.
In social media they write the unrest was a result of a traffic stop. The cops pulled a Honda Odissey with a foreign license plate, probably Chinese or Uzbek, the driver refused to cooperate and they chased him to a backyard of an apartment complex in Masanchi. The driver probably phoned his friends and someone opened fire on police from the building.
As information went public it probably fueled existing anti-Uzbek and anti-Chinese sentiments and people arrived to their town to punish them.