Grenade attack on Russian halal shop injures three

MOSCOW, May 5 (Reuters) - Attackers threw a grenade into a halal food shop in St Petersburg on Wednesday, injuring three in what may have been a religiously motivated attack, investigators said. The shop is located near a mosque in Russia's second city and the attackers may have had "extremist motives", the Prosecutor General's office said in a statement.

Three staff members were treated for shrapnel wounds, it said.

Rights campaigners say hostility to Russia's 20 million or so Muslims may increase because of twin suicide bomb attacks on the Moscow metro in March which killed 40. Police blamed female attackers from Russia's mostly Muslim North Caucasus region.

The Kremlin is struggling to contain an Islamist insurgency in the North Caucasus regions of Chechnya, Ingushetia and Dagestan, where militants wanting an independent Islamic state fight law enforcement forces on a daily basis. (Reporting by Amie Ferris-Rotman, editing by Tim Pearce)