A pair of car bombs exploded in a busy residential district in the central Syrian city of Homs, killing at least 25 civilians and wounding more than 100, Syria's official media reported.
The state news agency blamed Wednesday's attacks on "terrorists," the government's standard description of rebels fighting to oust the government of President Bashar Assad.
A pro-opposition group, the Britain-based Syrian Observatory for Human Rights, also reported the two car bomb attacks.
Syrian state television aired scenes of charred vehicles, blood-spattered streets and black smoke pouring from damaged buildings as firefighters rushed to douse blazes.
There was no immediate claim of responsibility for the bombings, the first of which occurred when a parked car exploded on a busy street near a popular sweet shop, state media reported. The second bomb detonated nearby about half an hour later as people gathered near the site of the initial attack, according to government reports.
The vehicles exploded in the city's Karm al-Louz district, home to many members of the minority Alawite sect, whose numbers include Assad and high-ranking commanders of the Syrian security services.
Alawite neighbourhoods and towns in Homs, Damascus and elsewhere have been frequent targets of rebel attacks in the more than three-year Syrian conflict. Government forces have focused their bombardment on rebel-occupied districts that are usually home mostly to Sunni Muslims, the majority population in Syria.
Wednesday's attacks came as rumours spread that the Syrian military may be planning an assault on Homs' Old City, which has been largely under opposition control for more than two years.
There has been no official confirmation of an impending offensive against the Old City. Pro-government forces surround the district and the 1000 or so residents said to be left suffer from lack of food, medical care and basic services. In February, more than 1400 people, including many former rebel fighters, left the Old City under safe passage in a United Nations-backed evacuation plan.
Most residents long ago fled from the Old City. Homs, once home to about 2 million people, has been a major front in the war.
Many Homs neighbourhoods, including much of the Old City and the adjoining Khalidiya district, have been largely reduced to rubble in a withering conflict that has cost more than 100,000 lives nationwide and sent millions of Syrians fleeing from their homes.
While the Syrian military has made steady gains, violence continues to wrack Homs and surrounding areas.
On Sunday, the Syrian Observatory for Human Rights reported that more than two dozen rebels were killed in the Old City when a vehicle that was being rigged as a car bomb detonated prematurely. Such bombs, sometimes driven by suicide attackers, have been potent weapons in the arsenal of the Syrian opposition.
A day later, an elderly Jesuit priest, Father Frans Van der Lugt, was assassinated by gunmen at his residence in the Old City. Each side blamed the other for the execution of the Dutch priest. He had lived in Syria for almost five decades and had declined to be evacuated, saying he preferred to remain and continue serving the people of his community, Christian and Muslim alike.
-Los Angeles Times