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ATHENS, Greece (CNN) -- Protests and fighting in Greece over the police shooting death of a teen-age boy flared again Tuesday as rioters clashed with police in front of the parliament building and at the boy's funeral.

Thousands paid their respects to the boy at his funeral, but a small number of protesters there grew violent at the end of the ceremony.

Some 10,000 people marched on the country's parliament in Athens on Tuesday to express their anger over the teenager's death, and also other issues like the economy, jobs, and allegations that the government is corrupt.

Groups clashed with riot police at the parliament and across central Athens.

Street riots started over the weekend after Athens police killed 15-year-old Alexandros Grigoropoulos on Saturday. Six young protesters had pelted a police patrol car with stones, and the teen was shot as he tried to throw a fuel-filled bomb at the officers.

While the shooting occurred in a neighborhood where there have been regular clashes with police, it immediately sparked clashes and riots in Athens and Thessaloniki, the country's second-largest city. The violence then spread to other municipalities.

The events have exacerbated the unpopularity of the ruling party and left Greek Prime Minister Kostas Karamanlis scrambling to shore up support

On Tuesday, he met with President Karolos Papoulias and cabinet members before briefing political leaders on the country's security situation.

Cleaning crews worked for hours early Tuesday to clear the mess left by the riots, but evidence of the violence remained. In some places, entire rows of shops still have broken windows.

The mayor of Athens asked residents not to dispose of garbage for a day because many of the city's trash bins were destroyed in the violence.

Karamanlis vowed again Tuesday that those responsible for the violence would be punished. See images of anarchy on Greek streets »

"I assured the president that no leniency will be tolerated in holding people accountable," he told reporters. "No one has the right to use this tragic incident as an alibi for actions of raw violence."

Athens police said 12 policemen were injured in Monday's violence and 87 people were arrested. There were 10 flashpoints across Athens where police confronted rioters, police said. Watch protesters clash with police »

Many of the young people who rioted holed up at universities, taking advantage of a decades-old rule that bars police from entering university grounds. The rule came into force after tanks crushed a 1973 student uprising protesting the ruling military junta.

The dean of Athens University resigned Tuesday as a result of the students' violent behavior.

Public and private schools and universities across the country were shut again Tuesday. Watch as iReporter witnesses the clashes

Demonstrators torched government buildings and the offices of the ruling conservative party in central Athens. They also set cars and trash containers ablaze.

Monday, young demonstrators barricaded streets in Athens and Thessaloniki and hurled gasoline bombs as they battled police. Clouds of tear gas hung over the capital as police tried to disperse the crowds. iReport.com: Are you there? Share photos, video of rioting

The police officer who fired the fatal shot at the teenage boy has been charged with "manslaughter with intent" and suspended from duty, police said, adding that a second police officer was arrested Saturday on criminal accessory charges.

Government officials, including the interior minister, have condemned the shooting.

Authorities conducted an autopsy on the boy Monday in an effort to clarify the circumstances of the shooting, but the boy's family has called in their own investigators to verify state findings, the Athens coroner told CNN

Rioters rampaged through Athens and the northern city of Thessaloniki Sunday, hurling Molotov cocktails, burning stores and blocking city streets with flaming barricades after protests against the fatal police shooting of a teenager erupted into chaos.

Youths wearing hoods smashed storefronts and cars in Athens. Riot police responded with tear gas while the fire department rushed to extinguish blazes. Several bank branches, stores and at least one building were on fire on a major street leading to the capital's police headquarters. Clashes also broke out near Parliament.

Streets quickly emptied as word of the violence spread. Local media reported several people sought treatment for breathing problems.

Violence often breaks out during demonstrations in Greece between riot police and anarchists, who attack banks, high-end shops, diplomatic vehicles and foreign car dealerships in late-night fire-bombings that rarely cause injuries.

Some believe the anarchist movement has its roots in the resistance to the military dictatorship that ruled Greece from 1967-74. The anarchists often take refuge inside university buildings or campuses, where police are barred under Greek law.

The shooting of the 16-year-old boy that set off the first riots took place Saturday night in Exarchia, a downtown Athens district of bars, music clubs and restaurants that is seen as the anarchists' home base.

The circumstances surrounding the shooting were initially unclear. Police said the two officers involved claimed they were attacked by a group of youths, and that three gunshots and a stun grenade were fired in response.