Two people are killed and four injured in a mass shooting outside Russia's Federal Security Service headquarters on Moscow's Lubyanka Square. The shooter is also killed.
Doctors treating Russian anti-corruption activist and opposition leader Alexei Navalny in Omsk refute claims that Navalny was poisoned before his flight from Tomsk to Moscow the previous day, citing that tests had shown no trace of any poison in his body. German Chancellor Angela Merkel has offered to transfer Navalny to Berlin for further treatment by sending an air ambulance to Omsk, but doctors have refused to discharge him, saying Navalny is in an "unstable" condition. Navalny's spokeswoman Kira Yarmysh claim the refusal is a ploy to hide the poisoning and "put his life at risk".
Russia's FSB state security agency says it has arrested a U.S. citizen "caught spying" in Moscow. According to former CIA officials the arrest was done as a retaliation for the arrest of alleged Russian spy Maria Butina.
Russian President Vladimir Putin signs an amendment to Russia's law regarding the regulation of the use of weapons, giving the FSB the authority to use lethal force on crowds in order to "prevent acts of terrorism, rescue hostages, or repel attacks on public buildings."