Russian investigators say a suicide bomber has attacked the funeral of a policeman in the volatile Caucasus region, killing seven other policemen and wounding at least 11 other people.

The funeral Sunday in a private home in Ingushetia was being held for a police officer who was shot dead Saturday.   

Ingushetia is one of the predominantly Muslim republics in Russia's restive North Caucasus region.

Sunday's attack came as Muslims in Russia and around the world prepared for the feast that celebrates the end of the holy month of Ramadan.

Russia is fighting an Islamist insurgency in the Caucasus, mostly in Dagestan and Ingushetia, with militants staging frequent attacks on police and other authorities.