In eastern Syria, students are reported among the dead from a car bomb explosion near a primary school in the province of Homs.
State-run media say the attack in the town of Umm al-Amed killed eight people, including six children.
Opposition activists reported at least 12 people killed.
Elsewhere, Syrian rebels say government aircraft continue to bomb rebel-held areas in the northern city of Aleppo.
The attacks have been going on eight days. Rebel activists say the government is dropping "barrel bombs" on civilians.
The United Nations says at least 100,000 people have been killed in the nearly three-year conflict between Syrian rebels and the government.
Images from Syria
1/7A man reacts at the site of what activists said was an air raid by forces loyal to Syrian President Bashar Al-Assad in the al-Marja district of Aleppo, Dec. 23, 2013.
2/7People run after what activists said was the return of government jet planes in the al-Marja district of Aleppo, Dec. 23, 2013.
3/7People react after what activists said was an air raid by forces loyal to Syrian President Bashar Al-Assad in the al-Marja district of Aleppo, Dec. 23, 2013.
4/7People inspect a site damaged by what activists said was an air raid by forces loyal to Syrian President Bashar Al-Assad in the al-Marja district of Aleppo, Dec. 23, 2013.
5/7In this citizen journalism image, a firefighter hoses down burning vehicles after a Syrian air strike in Aleppo, Dec. 22, 2013.
6/7This citizen journalism image shows damages of a burned bus after a Syrian air strike in Aleppo, Dec. 22, 2013.
7/7This citizen journalism image shows a destroyed building after a Syrian air strike in Aleppo, Dec. 22, 2013.
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