GROZNY, Russia (AP) — Police in Russia's Chechnya province say that an attacker has wounded two officers before being shot dead.

The authorities said the attack happened in Chechnya's provincial capital, Grozny, on Sunday when police stopped a vehicle for a check. The driver stabbed a policeman with a knife, and shot and wounded another officer before being killed.

Investigators on Monday identified the attacker as a 21-year-old resident of Grozny. They said they are looking at his possible connections with extremist groups.

The Islamic State group has claimed responsibility for the attack. The IS-affiliated Aamaq news agency said the attacker killed and wounded a number of guards at the gates of Chechen regional leader Ramzan Kadyrov's residence before being killed. The claim couldn't be independently confirmed.