Anarchists threw fire bombs and clashed with Greek police in Athens on Saturday during a march to parliament by more than 1,000 demonstrators protesting over the police killing of a teenager last month.

"About 150 anarchists who broke away from the rally threw rocks at the police who responded with teargas," said a police official, who declined to be named. "Later, they threw fire bombs at the offices of the defence minister."

The anarchists set on fire a newspaper kiosk and a bus station and caused minor damages to four banks in the centre of the Greek capital. Police chased small groups of youths around the city centre and detained at least two people.

Protests also took place in the southwestern Greek port of Patras, where three newspapers' buildings, a journalists union and three banks suffered slight damage.

Greece witnessed the worst riots in decades in December, triggered by the fatal police shooting of a 15-year-old boy and fuelled by anger at economic hardships and government scandals.

On Thursday, a protest march against an acid attack on an immigrant cleaner, who was a union activist, caused vandalism by groups of anarchists, who clashed with police.