Moscow, Russia: A suicide bomber killed four police officers and injured four more on Sunday during festivities for a local holiday in Grozny, the capital of Russia's troubled North Caucasus region of Chechnya, Russian news agencies reported.
The site of two separatist wars and a festering Islamic insurgency, Chechnya has seen a period of relative calm under the strong-arm rule of Moscow-backed leader Ramzan Kadyrov, and suicide bombings have been a rare occurrence in recent years.
The attack took place at the entrance to a concert hall where festivities were planned to celebrate Grozny's city day holiday, which is also Kadyrov's birthday.
"Police officers who were manning metal detectors at the entrance of the concert hall noticed a suspicious young man. When the police officers decided to check the individual, the man blew himself up," a local police officer told RIA news agency.
There were no immediate reports of civilian deaths or injuries, RIA said.
© Thomson Reuters 2014