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 five 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.