ATHENS, Greece — Masked youths attacked the French Institute in Athens with firebombs today, one of the sporadic acts of violence that still hit the capital almost daily since the police killing of a teenager nearly two weeks ago sparked the worst riots Greece has seen in decades.

The rage unleashed by the Dec. 6 shooting has lifted the lid on years of dissatisfaction over social inequality, poor employment prospects for young people and increasing anger with the conservative government's economic policies.

Late today a group of about 50 protesters interrupted the official premiere of the Greek National Theater, holding up banners urging people to join in demonstrations.

The youths threw pamphlets before running off.

In western Athens, masked youths damaged three cash machines and two bank fronts with stones and sticks.

Today's attack against the French Institute, a cultural and educational center, was carried out by about 20 masked men who left windows smashed and a guard's booth burned, but the building's interior was not seriously damaged, police said. A nearby bank ATM was also damaged, but nobody was injured.