Aleppo - Syria's second city - has been a key battleground in the conflict.
"We want reforms, drastic reforms, " said Fares Al-Shehabi, chairman of the Aleppo Chamber of Industry.
Fighting also raged elsewhere in Aleppo's old city, including near the Palace of Justice, it added.
In Syria on Saturday, the battle for control of Aleppo's international airport reportedly intensified.
BBC: Syria conflict: opposition coalition pulls out of talks
The Red Crescent has suspended some of its operations in Aleppo because of the heavy fighting.
As fighting raged in recent days, aid agencies scaled back their efforts in Aleppo.
Aleppo, in northern Syrian near Turkey, is the country's commercial capital and a World Heritage site.
Concerns centered on an attack Tuesday in Khan al-Asal, in the northern province of Aleppo.
Turkey's consulate in Aleppo, however, is still functioning, Turkish Foreign Ministry spokesman Selcuk Unal said.
Amateur videos posted on the Internet show demonstrators and burned campus rooms at Aleppo University.
In the early months of the uprising Aleppo, Syria's commercial capital, was largely spared the violence.
Two weeks ago they had to flee their homes from a village near Aleppo.
Regarded as the industrial capital, most of the factories in Aleppo have had to close down.
But last week, a detachment of Afash's fighters raided the offices of the Aleppo Media Center.
Violence has spread in recent weeks to Syria's two biggest cities, Damascus and Aleppo.
The city is a key point on the road from Aleppo to the south.
But conditions were so bad some families like hers chose to risk returning to Aleppo instead.
The ancient city of Aleppo has been inscribed on the World Heritage List since 1986.
The focus of the inquiry will be on an incident last month in Khan al-Assal, Aleppo province.
The BBC's Wyre Davies, on the Syria-Turkey border, says conditions in Aleppo are reported to be dire.
She comes from Ifreen in Aleppo province, but the violence there forced her to leave with her family.
Earlier, rebels and government forces reportedly clashed near Aleppo as they fought for control of a military airbase.
Father Nawras Sammour, a 44-year-old Jesuit from Aleppo, runs a nationwide relief program known as Jesuit Refugee Services.
Kazutaka Sato, her colleague from the Japan Press news agency who was with her in Aleppo, was unhurt.
BBC: Syria conflict: Japan reporter Mika Yamamoto flown home
He and his Turkish cameraman, Cuneyt Unal, are believe to have been arrested by Syrian forces in Aleppo.
BBC: Syria conflict: Japan reporter Mika Yamamoto flown home
He studied geography in Aleppo and learnt a bit of chemistry during a stint working in a pharmacy.
American aid means winter supplies for more than half a million people in Aleppo, Homs and Deir Ezzor.
Syria claimed rebels used chemical weapons in an attack Tuesday in Khan al-Asal in the northern province of Aleppo.
This has given them control of much of the city of Aleppo, Syria's largest, and one provincial capital, Raqqa.
He was a truck driver who shipped cargo between Aleppo and neighboring Turkey.
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