Russian military blogger Vladlen Tatarsky, real name Maxim Fomin, died as a result of the explosion[1][2][3] and 42 people were injured, 24 of whom were hospitalized, including six in critical conditions.

[16] According to several sources, including Russian authorities,[17] Vladlen Tatarsky was offered a statuette by a woman, which is thought to have subsequently exploded.

[22] A resident of Saint Petersburg, Darya Yevgenyevna Trepova (born 16 February 1997),[23] was considered as a suspect by the Investigative Committee.

[24][25] Investigators believed that she brought to the café a box with a bust of Tatarsky, in which an explosive device was mounted.

[26] She had earlier been detained for 10 days, along with her husband, after attending an anti-war protest against the Russian invasion of Ukraine on 24 February 2022 for apparently ignoring police orders to disperse.

[27] Russian officials also claimed she was an "active supporter" of jailed opposition leader Alexei Navalny.

[30] Rylov, a member of the fringe opposition Libertarian Party of Russia, stated that "she would never kill" and that he believed she was framed.

[41] On 4 April, Trepova was charged by the Investigative Committee under the criminal code with a "terrorist act committed by an organized group that resulted in the deliberate infliction of death on a person" and the "illegal carrying of explosive devices committed by an organized group".

[47] Trepova was brought before a court on 15 November,[48] to be charged with carrying out a terrorist attack, illegal trafficking of explosive devices and forging documents.