At least five people were killed and many more wounded on Monday by a fresh rocket attack from the rebels in the northern city of Aleppo, state news agency SANA reported.
The attack targeted the Sheikh Maqsud district, a day after 14 people were killed by a similar attack against the same neighborhood, according to SANA.
Meanwhile, the oppositional Syrian Observatory for Human Rights has confirmed the report, saying the so-called Thuwar al-Sham group, or the Levant Revolutionaries, was responsible for shelling Sheikh Maqsud with 38 improvised rockets since Sunday.
It added that some people are still stuck under the rubble as a result of the intensified shelling against that neighborhood, which is largely inhabited by 40,000 people, largely Syrian Kurds, and around 30,000 displaced people.
The UK-based watchdog group said the district is a daily target to rebels from the Thuwar al-Sham, as well as the al-Qaida-linked Nusra Front and likeminded groups.
The attack is the latest in a series of rebels' shelling on government-controlled parts of Aleppo, Syria's largest city and once the economic capital of the country.
Large swathes of Aleppo are excluded from the ceasefire agreement, which went into effect last week, due to the heavy presence of the al-Qaida-linked Nusra Front and Islamic State (IS) group, both designated as terrorists by the United Nations.