A suicide bomber has blown himself up in a truck at a traffic police checkpoint in Russia's volatile Ingushetia region.
One person has been killed and at least five have been injured according to local media sources.
The attack took place at 950pm Moscow time in the city of Nazran
The Ingush interior ministry has told state-controlled RIA news agency, that the attack underscored the region's Islamist insurgency which local leaders say has permeated all levels of society.
The local hospital has said that two policemen and three passers-by were wounded in the attack.
Growing turbulence in the North Caucasus has become a major headache for the Kremlin, which is worried violence could spill over into other parts of Russia, which is home to some 20m Muslims and dozens of nationalities.
Separately, a woman carrying grenades and a semi-automatic pistol was caught in a mobile phone shop in Dagestan's capital Makhachkala and detained by police.
According to security sources they have said'She wanted to become a martyr and was preparing terrorist activity in Makhachkala.'
Ingushetia has suffered a series of bomb attacks amid a surge in violence across the North Caucasus region in recent months.
A series of suicide bombs and armed attacks on police and security forces inIngushetia and Dagestan, have shattered a few years of relative calm in the North Caucasus.