Arson at the OBI store on ul. Radzymińska in Warsaw. The National Prosecutor's indictment dates the act to 13-14 April 2024. The extent of the damage and any casualties are not established in the source used.
Responsibility and limits of the evidence
officially attributed
A court or a competent state body has attributed it. That is not the same as a proven attack: an indictment is an allegation, not a verdict.
Named party: Russian Federation intelligence service
B - official attribution by a state body
Prokuratura Krajowa / 2026-03-25 / carrying out the act
On 25 March 2026 the National Prosecutor's Office filed an indictment covering the arson of the OBI store in Warsaw, alleging that the accused acted "on behalf of the foreign intelligence service of the Russian Federation". An indictment is an allegation, not a verdict.