A ranar 3 ga Afrilu, 2017, an gano wani na'ura mai dauke da 200<unk>300 grams (0.44<unk>0.66 lb) na fashewa a cikin jirgin da ke tafiya ta hanyar rami tsakanin tashoshin Sennaya Ploshchad da Tekhnologichesky Institut na St. Petersburg Metro. A cewar wata sanarwa daga Ma'aikatar Harkokin Kasuwanci, bam din ya tashi a karo na uku na jirgin. Shaidun gani da ido sun ce fashewar ta faru a kusa da kofa. Nan da nan bayan fashewar, hayaki ya cika dandalin. Bidiyo daga kafofin watsa labarun ya nuna mutane da yawa da ke kan dandalin da kuma ƙofar karfe da ƙarfin fashewar ya karkatar. Bayan rahotannin fashewar, duk tashoshin metro a Saint Petersburg an rufe su da sauri. A cikin marigayi maraice, an rufe ayyukan metro a Lines 3, 4 da 5. An gano bam na biyu kuma an kashe shi a Vosstadianiya. An gano na'urar a cikin motar ta uku na jirgin kasa, wanda aka ɓoye shi a cikin jakar da ke dauke da makamai mai guba da makamai mai guba da
a cikin jirgin kasa