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The blast comes a day after twin explosions in Damascus killed over two dozen.
Three people were killed when a car bomb ripped through Syria's northern city of Aleppo on Sunday, opposition activists told CNN. The British-based opposition group the Syrian Observatory for Human Rights estimated another 25 were wounded in the explosion.
No one has claimed responsibility for the attack. State news agency SANA blamed the blasts on "terrorists." Opposition activists said the bomb detonated near the city's political security branch and near a church, according to Reuters.
The blast come a day after twin blasts exploded in Damascus killing an estimated 27 people.
More from GlobalPost: Damascus 'terrorist' blasts
Meanwhile, at least 20 people were killed in clashes throughout Syria om Sunday, including two children and seven soldiers from the Free Syria Army, according to the Local Coordination Committees of Syria, CNN reported.
The BBC said that President Bashar al-Assad has a high level of support in both Damascus and Aleppo and both cities are under tight government control to prevent mass opposition protests like those in Homs and Idlib.
The Guardian said the bombing came as security forces arrested activists at a rare anti-government protest.
More from GlobalPost: Annan urges UN action on Syria, will return for talks
The International Committee of the Red Cross said it is increasingly worried about the humanitarian crisis in the country.
"The ICRC is particularly concerned about vulnerable people, such as those detained in connection with the fighting and those who are sick or injured and need medical care," said ICRC president Jakob Kellenberger, who is due to meet with Russia's foreign minister in Moscow on Monday.
Russia and China have twice vetoed the UN Security Council resolutions on the Syrian confilct. UN-Arab League special envoy Kofi Annan briefed the security council on Friday urging them to act with "one voice."
Annan said he will return to Syria for more talks with Assad. The UN estimates some 8,000 people have died as a result of the violence.