Russian police in the city of Tobolsk say they are holding a man on suspicion of placing homemade explosive devices in mailboxes.
According to the investigators, the 34-year-old local resident placed homemade explosive devices into mailboxes of residents in an apartment building in Tobolsk.
The explosions on June 21 and 28 severely injured a 62-year-old woman and a 50-year-old man.
Investigators say the suspect was found at his country house where he resides in summer.
Inside his house were components to make explosive devices.
Based on reporting by ITAR-TASS and Interfax