ALEPPO, Syria — Shells slammed into the northern Syrian city of Aleppo Thursday, killing two people as thousands of government supporters gathered in a main square nearby to celebrate last month's capture of the city's eastern neighborhoods from rebels.
The shells struck a few kilometers (miles) from Saadallah al-Jabiri Square, where national music was blaring from giant loudspeakers and people danced and chanted pro-government slogans.
The gathering dispersed shortly afterward, highlighting the fragile security in the city. The capture of Aleppo on Dec. 22 brought Syria's largest city back to the full control of Syrian authorities for the first time since July 2012, marking Assad's biggest victory since the uprising against him began nearly six years ago.
During the demonstration, a woman led the protesters in a pledge to preserve Syria and protect it against rebels and their foreign backers. About an hour later, a shell exploded in the distance, leading some of those gathered to hurry away. Minutes later another shell exploded in the distance, causing more to leave.
"We are here to celebrate the victory in Aleppo," said housewife Faten Sawwas, as she left the square with her two daughters. "God willing the crisis is beginning to end and we will rebuild Syria."
Rebels on the western outskirts of the city have been shelling it with rockets and mortar rounds despite a cease-fire that has been in place since Dec. 30. Both sides have carried out attacks despite the truce, which excludes al-Qaida-linked militants and the Islamic State group.
Heavy fighting broke out Thursday between government forces and Islamic State militants near an army base outside the militant-held town of Palmyra. The extremists recaptured the ancient town in December from government troops — nine months after IS was expelled in a Russia-backed offensive.
Opposition activists on Thursday said IS has killed 12 people it held captive in Palmyra by shooting and beheading them, with some of the slayings carried out in the city's second-century Roman amphitheater.
When they previously controlled Palmyra, IS militants had used the Roman amphitheater for public killings, including those in a video showing 25 boys with pistols shooting captured Syrian soldiers, the ancient colonnades visible in the background.
IS has destroyed ancient temples and other relics, triggering fears among experts for remaining antiquities in the city. Most residents fled Palmyra following the government offensive last March.
The Britain-based Syrian Observatory for Human Rights and another activist network, the Palmyra Monitor, said the 12 captives were killed on Wednesday. They were captured as they tried to escape the IS offensive on Palmyra last month.
The Observatory said four teachers and government employees were beheaded in the courtyard of the Palmyra museum. The Observatory and the Palmyra Monitor said the others — four opposition fighters and four pro-government troops — were first shot, then beheaded in the Roman amphitheater or in a former Russian base in Palmyra.
The Observatory also said Thursday that IS militants displayed the heads of six pro-government fighters in public, in different parts of the town of al-Mayadeen in the eastern province of Deir el-Zour, where the extremists are waging an offensive. It was not clear if the six were killed in battle or after they were taken captive.
Over the past year, IS has suffered defeats in both Syria and Iraq, losing several towns and cities it had captured in 2014. Earlier this month it launched a major assault on the government-controlled part of the city of Deir el-Zour, the provincial capital. Activists said it was the most aggressive onslaught on the government area and a nearby military air base in a year.
El Deeb reported from Beirut.