A gunman killed one employee and a visitor at a Federal Security Service (FSB) office in Russia on April 21. Another visitor was injured and the attacker was killed, according to the FSB.
The incident happened in the Khabarovsk region of the Russian Far East, which is near China.
The FSB is the successor organization to the Soviet KGB.
The gunman was a local resident, born in 1999. He belonged to an unnamed nationalist group, Russian news agency TASS reported.
The visitor who was killed and the one who was injured were from former Soviet states outside Russia.
Earlier this month, a suicide bombing at the St Petersburg metro killed 16 people.