Communication channels have reportedly been established between the Polish and American intelligence services to coordinate the inquiry.
U.S. authorities are treating the situation seriously, with the National Security Agency (NSA) involved in the investigation. Other American agencies are also in contact with their Polish counterparts.
Senator Roger Wicker, a member of the U.S. Commission on Security and Cooperation in Europe, said the sabotage “requires a decisive response from the United States,” highlighting the incident’s significance amid heightened concerns about attacks on critical infrastructure in Eastern Europe.
On Nov. 18, the investigation determined that the explosives used in the attack were remotely detonated by phone. One of the devices exploded, while a second failed to detonate for reasons that remain unclear. Investigators recovered the SIM cards inserted into the triggering devices and traced their registration to a single passport.
Two Ukrainian citizens who collaborated with Russian intelligence are suspects in the sabotage.
Polish Prime Minister Donald Tusk called the incident an unprecedented act of sabotage, noting that the Warsaw–Lublin corridor is critical for transporting aid to Ukraine. The explosion destroyed part of the track.