No-one has been convicted of the car bombing which destroyed the seven-storey cultural centre.
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Last week, Syria handed over at least five suspects in a deadly car bombing of a busy Turkey-Syria border gate.
All were sons of the cafe owner, Mohammed al-Khishali -- killed in a car bombing that ripped apart the cafe in 2007.
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Separately, the state Sana news agency said three journalists working for state TV in Aleppo province were wounded in a car bombing on Sunday.
The U.S. military said one Iraqi policeman was killed and another was wounded in the car bombing, which also destroyed three buses and damaged local shops.
In October, Wissam Al-Hassan, the Lebanese chief of the Internal Security Forces Information Branch in charge of Samaha's case, was assassinated in a car bombing that rocked central Beirut, Lebanon.
Portugal's Jorge Sampaio and Brazil's Luiz Inacio Lula da Silva are also absent, while Venezuela's Hugo Chavez looks likely to remain at home after a car bombing killed a top prosecutor.
The Irish government has been under pressure from the main opposition party Fine Gael over the effectiveness of the investigation into the car bombing of Omagh, County Tyrone on 15 August 1998.
White House officials announced Wednesday that Clinton will visit Omagh, the site of an Aug. 15 car bombing that killed 28 people and injured more than 330, during his trip next week.
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In Basra, a Shiite-majority port city in southern Iraq, a car bombing at a gathering of day laborers killed 13 people and wounded 50, according to an official in the Basra Command, Iraq's southernmost military detachment.
The leader of the Supreme Council for the Islamic Revolution in Iraq (Sciri), Ayatollah Muhammad Baqr al-Hakim, was among about 100 people killed in a massive car bombing in the Shia holy city of Najaf in August 2003.
Most of those killed in the coordinated attacks were victims of the first suspected car bombing near the Constitutional Council -- which oversees elections -- and Supreme Court in the Algiers neighborhood of Ben Aknoun, according to the state-run Algeria Press Agency.
The U.S. military also announced the Wednesday arrest in northern Arab Jabour of a man described as a foreign fighter who heads a car-bombing cell network.
He was hit while out of his car, exchanging fire with the bombing suspects, the transit police chief said.
Kenyan police had three people in custody Wednesday in connection with the attacks, including a car dealer who said he sold the bombing vehicle to two men of Arab descent.
Collier was shot dead in his car on 18 April, three days after the bombing.
He was shot several times by police, then was run over with the car by his fleeing brother, Dzhokhar Tsarnaev, his accomplice in the deadly April 15 bombing, authorities have said.
He had offered the car to his teenage children to drive to school, telling them stories of his own adolescent adventures bombing around in a friend's 1963 Plymouth Valiant wagon.
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La Terraza was blamed for a similar car bomb attack in January at a shopping mall in Medellin, near the site of Thursday's bombing.
In the week before the bombing, Saudi security forces had claimed to have captured and defused no fewer than five similarly designed car bombs.
It seeks to locate both suspects at the scene of the bombing and then pieces together the operation to intercept them three days later, as they drove a hijacked car near the city, hours after images of their faces were broadcast by the media.
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