The explosion, reportedly carried out by armed terrorists, comes a day after Syria and the UN signed an agreement outlining the functions of an observing mission aimed at monitoring a ceasefire in the country. The first group of UN observers arrived in Syria on Sunday.
Calm has returned to most parts of Syria since a ceasefire, brokered by the UN-Arab League envoy Kofi Annan was announced a week ago, though there have been reports of sporadic clashes in some parts of the country with Damascus accusing armed groups of violating the truce by continuing attacks on government forces.
Opposition figures have been claiming the army has killed a number of civilians since the ceasefire took effect last Thursday.
Syria has been experiencing unrest since mid-March 2011 and many people, including security forces, have been killed in the unrest.
PG/HGH