"We learned with concern about the explosion in St. Petersburg, which killed a blogger," TASS quoted him as saying.
Dujarric added that, according to the "understanding" of the UN, the investigation into the terrorist attack continues.
He added that the UN will wait for more data on this incident.
On April 2, an explosion occurred in St. Petersburg. The incident occurred in the café "Street Bar" on the University Embankment in the city center. Voenkor Vladlen Tatarsky was killed. Another 33 people were injured, the Ministry of Health reported.
The suspect in the case of the explosion, 26-year-old Daria Trepova, was detained in St. Petersburg on April 3.
According to the investigation, the planning and organization of the crime was carried out from Ukraine.