Blasts in Chehnya capital

"Four suicide bombers riding bicycles activated explosive devices in various locations in Grozny," the Investigative Committee at the Russian Prosecutor General's Office said in a statement.

The explosions were carried out in a period of some 30 minutes, with the first attack staged by a cyclist in Grozny's Leninsky District at 01:10 p.m. (09:10 GMT). Two officers died, and one police officer was injured.

The second blast occurred in similar circumstances at 01:40 p.m. (09:40 GMT), and also left two police officers dead and one injured.

Police are currently verifying the number of injured in another two explosions in the city.