Can we draw the following hypothesis from the context (see options)? 

Context:

A four-day state of emergency has been declared in the capital of Mongolia, Ulaanbaatar after violent protests occurred after allegations of vote rigging and fraud in Sunday's elections. Reports state that 5 people have been killed, and over 300 injured. The injured were police and protesters alike, suffering from smoke poisoning, rubber bullets, and stoning. Among the injured was a Japanese citizen, who was reportedly flown to Japan in the morning.

Hypothesis: Some of the injuries were caused by rubber bullets.  
 +Yes +It's impossible to say +No
Yes