On Friday, Syrian troops killed dozens of foreign-backed insurgents in the Raqqa and al-Khafseh neighborhoods on the outskirts of the city.
Earlier in the day, three reinforcement teams were sent to Aleppo to clear the city of insurgents and restore security.
Meanwhile, heavy clashes have broken out between the Syrian Army and insurgents in the al-Tadamun neighborhood of Damascus.
Syrian government forces have also engaged the insurgents on the outskirts of the western city of Homs.
On Thursday, the Yarmouk Palestinian refugee camp in Damascus came under mortar fire from the insurgents.
Thursday’s attack occurred on the same day UN-Arab League envoy to Syria Kofi Annan announced that he had decided to step down from the post at the end of the month due to lack of support at the UN Security Council and the increasing militarization of the conflict.
United Nations Secretary General Ban Ki-moon issued a statement saying Annan did not plan to renew his mandate after its expiry on August 31.
The Syrian Foreign Ministry expressed regret over the resignation and said the country is still committed to the six-point peace plan negotiated by Annan.
On Friday, Russian Deputy Foreign Minister Gennady Gatilov said Annan’s resignation paves the way for a military intervention in Syria.
"Annan is an honest international mediator, but someone wants to push him out of the game in order to open the gates for military actions. This is obvious," Gatilov added.
On Friday, the UN General Assembly passed a non-binding resolution condemning the UN Security Council for failing to agree on measures to end the unrest in Syria.
Russia said it would not support the resolution because it is unbalanced and encourages insurgents to keep fighting.
Syria has been experiencing unrest since March 2011. Damascus says outlaws, saboteurs, and armed terrorists are the driving factor behind the unrest and deadly violence while the opposition accuses the security forces of being behind the killings.
Western states have been calling for Syrian President Bashar al-Assad to step down. However, Russia and China are strongly opposed to the Western drive to oust Assad.
The Syrian government says that the chaos is being orchestrated from outside the country, and there are reports that a very large number of the armed militants are foreign nationals, mostly from Egypt, Algeria, Saudi Arabia, and Afghanistan.