Six policemen have been wounded in a militant attack at a security checkpoint in Russia's North Caucasus region of Chechnya.
Chechnya’s Interior Ministry said the incident near Grozny on May 9 left three of the police officers in a grave condition.
Security measures have been beefed up in Chechnya as Russia and some other former Soviet republics mark the 71st anniversary of the victory over Nazi Germany in World War II.
May 9 also marks 12 years since the former President of Chechnya Akhmad Kadyrov was killed in a bombing in the central stadium in Grozny during the Victory Day parade.
Islamic insurgents took responsibility for that attack which killed more than a dozen other people.
Akhmad Kadyrov's son, Ramzan Kadyrov, is Chechnya's Kremlin-appointed leader.