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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

Police were reviewing video from surveillance cameras in an attempt to identify who trampled to death a Wal-Mart worker after a crowd of post-Thanksgiving shoppers burst through the doors at a suburban store and knocked him down.

Criminal charges were possible, but identifying individual shoppers in Friday's video may prove difficult, said Detective Lt. Michael Fleming, a Nassau County police spokesman.

Other workers were trampled as they tried to rescue the man, and customers stepped over him and became irate when officials said the store was closing because of the death, police and witnesses said.

At least four other people, including a woman who was eight months pregnant, were taken to hospitals for observation or minor injuries. The store in Valley Stream on Long Island closed for several hours before reopening.

Police said about 2,000 people were gathered outside the Wal-Mart (nyse: WMT - news - people ) doors before its 5 a.m. opening at a mall about 20 miles east of Manhattan. The impatient crowd knocked the employee, identified by police as Jdimytai Damour, to the ground as he opened the doors, leaving a metal portion of the frame crumpled like an accordion.

"This crowd was out of control," Fleming said. He described the scene as "utter chaos," and said the store didn't have enough security.

Dozens of store employees trying to fight their way out to help Damour were also getting trampled by the crowd, Fleming said. Shoppers stepped over the man on the ground and streamed into the store.

Police built a massive cordon around anti-government protesters occupying Thailand's main airport Saturday, raising fears of an imminent confrontation in a standoff that has disrupted the country's economy and the travel industry worldwide.

About 2,000 policemen were deployed around Suvarnabhumi international airport, where protesters calling themselves the People's Alliance for Democracy have camped out since late Tuesday, forcing the halt of all flights.

With no sign of the standoff easing, the airport authority said Suvarnabhumi will remain closed at least until Monday evening.

The protesters also have occupied Bangkok's domestic airport and the prime minister's office compound, virtually paralyzing the government in their campaign to force its resignation.

The confrontation, severing the capital from civilian air traffic, has taken a heavy toll on Thailand's economy and reputation. According to Thai media reports some 100,000 tourists are stranded, and schedules of airlines around the world have been disrupted.

So far security forces have only issued a warning to the protesters to leave and refrained from using force. The protesters say they will not leave until the government of Prime Minister Somchai Wongsawat resigns.

But it appears the government's patience is wearing thin.

PETIONVILLE, Haiti (CNN) -- Authorities have detained the owner of a Haitian school that collapsed, killing at least 84 students. Meanwhile, rescue workers continue to comb through the rubble in search of survivors.

Fortin Augustin, who owns College La Promesse Evangelique in Petionville, surrendered to authorities on Saturday, police spokesman Garry Desrosier told The Associated Press.

Desrosier said Augustin has not been charged. He is currently being detained at a police station near Port-au-Prince.

As many as 700 children were on the school grounds, celebrating the school's birthday when the building collapsed about 10 a.m. Friday ET, said Abel Nazaire, deputy coordinator of Risk and Disaster Management in Port-au-Prince.

By Saturday night, 150 people had been injured, but many more remained missing, Nazaire said.

Officials said it has not been easy to determine how many people were inside the building at the time of the collapse. Watch CNN reporter describe the scene »

"Yesterday (Friday), there was a special event at the school, so there were not only pupils, but family members and friends who were invited," said Rob Drouen, a spokesman for the International Committee of the Red Cross. "It's very difficult to say how many people were in the school."

Most of the students at the school ranged in age from 10 to 20, officials said, but some are younger. Haitian press reports said kindergarten, primary and secondary students attended the school.

Amelia Shaw, a journalist with United Nations TV who visited the scene, said the second floor of the building crumbled onto the first. Haitian President Rene Preval has said the structure of the three-story school building was "really weak" and called for a review of construction guidelines.

International aid crews continue to sift through the wreckage in search of survivors.

Earlier Saturday, rescue crews pulled out several children alive, prompting cheers and reviving hope among parents. Since then, there had been no signs of life. Watch how search for survivors can be painful »

Rescuers discovered the bodies of 20 children and their teacher in a classroom.

"Throughout history, there's been people found 48, 72 hours later -- still alive, in good shape," said Michael Istvan of the U.S. Agency for International Development (USAID), one of several agencies helping with the recovery effort.

Rescue workers punched holes in the concrete and sent down cameras looking for signs of life. A crane lifted chunks of concrete, while dogs were brought in to help with the recovery effort.

Officials said one of their biggest concerns is the vibrations from the power generators. They said too much vibration can shake loose pieces of concrete on the damaged hillside structure, sending them tumbling down and causing more casualties.