A bomb exploded near a highway at the southern edge of Syria's capital Damascus on Sunday morning, state media reported.
An attacker was arrested and no one was injured, state news agency SANA said. The head of the city's civil defence, Asef Hababe, told Reuters that military technicians had detonated a device.
The Syrian Observatory for Human Rights, a UK-based war monitoring group, said the explosion was near a security post.
Meanwhile, on the anniversary of Turkey's Operation Olive Branch in Syria, a bomb was detonated which killed 3 and wounded 20 others in Afrin.
Syria's war has killed hundreds of thousands of people, forced more than half its pre-war population from their homes and dragged in global powers.
With Russian and Iranian help, Syrian President Bashar al-Assad's military has beaten back rebels and Daesh to restore control over most of the country.