Petraeus, a former CIA director, was allegedly at a nearby station when Russian unmanned aerial vehicles struck a train near the Ukraine-Poland border.
Ukraine Railways said another train was hit immediately after a train carrying former UK Prime Minister Boris Johnson, former Swedish Prime Minister Carl Bildt and UK National Security Adviser Jonathan Powell had passed.
According to the agency, it is highly likely that Russian unmanned aerial vehicles deliberately targeted the train carrying the European politicians. The agency said efforts were underway to clarify the details of the incident.