You should treat both sides as untrustworthy. Fabricated evidence, or just total lack thereof, is used by both sides.
It's an amazing trait of modern wars. We often say that cyberwarfare is the threat of the future, but right now information wars, shaping public opinion that's malleable and not always critical enough of the fact presented, is maybe a bigger thing than actual firefights on the ground. Modern technology makes information easy to manipulate, easy to inject into public view, and far, far easier to spread.
Unless a war goes on in your homeland right next to you, you can't really tell if you're being told the truth.