BEIRUT — Riding a wave of momentum, Syrian rebels made a run on Aleppo Saturday in some of the fiercest fighting seen in the country’s largest city, which has been a key bastion of support for President Bashar Assad over the course of the 17-month-old uprising.
The rebels also took over a third border crossing, and the second one along Syria’s northeastern frontier with Iraq, another sign that the regime’s tight grip on the country is wobbling.
The fighting in Aleppo comes on the heels of intense clashes in the capital, Damascus, as rebel forces target the pillars of regime power in their attempts to usher in what they hope will be the end of Assad’s rule.
“There were huge explosions, and the gunfire didn’t stop for several hours,” Aleppo-based activist Mohammad Saeed said. “The uprising has finally reached Aleppo.”
The city has remained largely loyal to Assad and been spared the kind of daily bloodshed that has plagued other areas.
Saeed said dozens of fighters from the rag-tag Free Syrian Army entered Aleppo, a commercial hub, from the countryside and were fighting regime troops from inside.
It was the first sustained fighting in the city center, focused on the Salaheddine district, although there have been protests in Aleppo and violence on the outskirts.
The rebels have put the regime on the defensive after a week of battles in Damascus, including a bombing that struck at the heart of the regime, killing four high-level government officials.
The coming days will be crucial to determining whether the regime can recover from the blows, which have punctured the sense that Assad’s hold on the country is impenetrable.
Rebels also took over the Syrian side of the border crossing at the Iraqi town of Rabiya, 320 miles northwest of Baghdad, according to Atheel al-Nujaifi, the governor of Iraq’s Ninevah province.
Iraqi officials said rebels tore up and shot at posters of Assad but did not face any resistance from regime authorities who surrendered the sprawling, dusty border crossing peacefully. Iraqi officials quickly barricaded the crossing and ordered additional troops to secure the area.
Rebels also seized the Syrian side of the border crossing at the Iraqi border town of Qaim on Thursday. Rebels also attacked a remote Syrian military post near the border on Thursday, killing 21 soldiers, and overran a border checkpoint with Turkey last week.
French Foreign Minister Laurent Fabius warned Assad to prepare to leave.
“Bashar Assad’s regime is condemned by his own people, who show great courage,” Fabius said. “It’s time to prepare for the transition and the day after.”
He also encouraged the opposition, which is fractious and beset by infighting, to unite.
“It’s time for the opposition to get started on taking control of the country,” he said. “We want the rapid formation of an interim government that will be representative of the diversity of Syrian society.”
Damascus and Aleppo are home to elites who have benefited from close ties to Assad’s regime, as well as merchant classes and minority groups who worry their status will suffer if Assad falls.
But for months, rebels have been gaining strength in poorer towns and cities in the Aleppo countryside, gaining footholds near the Turkish border.
Anger has been building inside Aleppo at the government’s deadly crackdown on the uprising and in recent months, huge anti-government demonstrations have broken out, particularly among students at Aleppo University.
In May, Syrian forces stormed student dormitories during an anti-government protest at the university, firing tear gas and bullets in an hours-long siege that killed four students and forced the closure of the school.