Syrian television said the explosion caused major damage in nearby houses.
Over the weekend, at least 50 people were killed by rebel rocket fire into government-controlled areas of Aleppo, a monitoring group said on Monday. An anti-Assad uprising broke out in March 2011 and later escalated into civil war.
A Syrian official called on Monday on Syrians to vote in the coming presidential election, calling it a "genuine opportunity" to express their will amid the country's 3-year-old conflict.
Syrians will vote Tuesday in their country's first multicandidate presidential elections. President Bashar Assad is all but guaranteed to win a third seven-year term in a vote denounced by the Syrian opposition and its Western allies as a mockery.
Syrian rebels have threatened to disrupt the voting in government-held areas. Thousands of people already have fled the northwestern city of Idlib amid fears of attacks.