BEIRUT — Fighting raged near a military base in Syria's north as a cease-fire in the bloody civil war was set begin Friday at dawn, activists said, illustrating the difficulty of enforcing even a limited truce coinciding with a Muslim holiday.
Elsewhere, violence appeared to die down, and thousands of protesters took advantage of the lull to mount some of the largest anti-regime demonstrations in months.
The truce, proposed by U.N.-Arab League envoy Lakhdar Brahimi and endorsed by the Security Council, is set for only the four days of the Eid al-Adha holiday, has no monitoring mechanism and no stated plans for its aftermath.
The first serious disruption involved a radical Islamic group, Jabhat al-Nusra, that rejected the cease-fire from the outset. The group clashed Friday with regime forces for control of a military base outside of a strategic town on the road to the northern city of Aleppo, according to the Britain-based Syrian Observatory for Human Rights, which relies on a network of activists.
Fierce fighting has been going on there for several days.
Opposition fighters seized Maaret al-Numan, which lies along the main highway between Aleppo and Damascus, earlier this month. Their presence has disrupted the ability of the Syrian army to send supplies and reinforcements to the northwest, where troops are bogged down in a stalemate with the rebels in Aleppo, Syria's largest city.
Activists said three people were killed in shelling of the Damascus suburb of Harasta and two people died as a result of sniper fire. There were no reports of clashes or protests at the time of the attacks, the Observatory said.
The Observatory said protesters rallied after holiday prayers in Aleppo, in central province of Homs and the city of Hama. Demonstrators also took to the streets in the suburbs of Damascus, and across the southern province of Deraa, where the uprising began. Three people were wounded when troops tried to disperse protesters in Deraa, the group said.
The demonstrations were reminiscent of the mass protests that ignited the civil war. In recent months, gatherings have been smaller, a result of a brutal crackdown by the Assad regime.
"It reminds me of the early days of the revolution, the days when people could go out and protest peacefully," said activist Khaled al-Shami, who is based in Damascus. Security was tight around the capital, and police forces erected additional checkpoints on main roads. In side streets, people performed prayers and protested freely, al-Shami said.
"It seems there is an attempt by both sides to abide by this truce, at least in Damascus," al-Shami said, adding that the truce was "a good thing that unfortunately will not last."
The latest fighting showed the complexity of the situation, with the badly fragmented opposition sending mixed signals about the truce, some endorsing it but others rejecting it as irrelevant.
President Bashar Assad's government accepted the truce but left significant loopholes, declaring it would respond to any rebel attack or attempts by foreign forces to intervene.
If the truce holds, it would be the first actual halt in 19 months of fighting that began with mass demonstrations but has transformed into a full-blown civil war with sectarian overtones and tens of thousands of dead.
Earlier attempts by mediators to bring about a cease-fire failed, though elements of both sides had accepted truce proposals.
Activists on the ground said the regime cannot be trusted because it has broken too many promises.
"The truce is a joke," said Mohammed Saeed, an Aleppo based activist, via Skype. "The regime that slaughters hundreds of its own people every day cannot be serious about a truce."
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