Greek police say scores of anarchists have attacked police with petrol bombs outside a central Athens precinct, and one officer was injured in ensuing scuffles.

About 150 youths took part in the attack late Thursday, police said. They said about 20 petrol bombs were thrown at police outside the precinct, and police responded with stun grenades and tear gas.

Seven people were detained on suspicion of taking part in the attack. One car parked near the precinct was damaged.

The precinct, in the city's central Exarcheia district, is frequently attacked by anarchists.