Often it is difficult or impossible to evaluate validity of witness statements, but there are exceptions.
Pay close attention to witness statements: are there actual confirmations to the journalistic claims made, or are they speaking on some general subject matter (which the mass media would later use in their own interests)? Furthermore, pay attention to the actual witness: have you seen him/her before in another context?
The main condition for identification of a fake is critically thinking about the information you’re presented with. Informational warfare is a very important element of confrontation between countries, so try not to take information on faith, without having been fully convinced of its validity.