At least 12 people have been killed and 30 others wounded in a terrorist attack by foreign-backed militants in Syria's northwestern city of Aleppo, Press TV reported.
According to Syria's state television, children were among the casualties in "terrorist shelling of the city" on Monday.
The so-called Syrian Observatory for Human Rights also reported the terrorist attack in Syria's second city, Aleppo, but put the death toll at 13.
The Britain-based group said at least 33 people were wounded in the attack, adding that the rocket fire hit several neighborhoods in west of Aleppo.
The bombing came a day after four people were killed in mortar attacks in Aleppo, which has been gripped by clashes between Syrian army forces and militants. The attacks also caused property damage.
Syrian forces and a number of different militant groups have been fighting for control over Aleppo, Syria's major business town and the country's second largest city.
This comes as the ISIL terrorist group, with members from several Western countries, controls parts of Syria and neighboring Iraq, and has been carrying out horrific acts of violence such as public decapitations and crucifixions against all communities, including Shias, Sunnis, Kurds and Christians.
Some 3.33 million Syrians have left their country since the beginning of the crisis in March 2011. A total of 7.2 million people have also become internally displaced, according to a recent United Nations-ordered report entitled "Syria: Alienation and Violence, Impact of the Syria Crisis."
So far, over 215,000 people have been reportedly killed in Syria.
The militants who have wreaked havoc on Syria are backed by the US and its Western and regional allies as part of attempts to overthrow Syrian President Bashar al-Assad.
In a report on Monday, the Human Rights Watch (HRW) said foreign-backed terrorist groups fighting the Syrian government have resorted to car bombs and rocket attacks to kill Syrian civilians.
The report focused on indiscriminate car bombs, mortar attacks and unguided rocket attacks by the terrorist groups in heavily populated, government-controlled areas and said the attacks have killed hundreds of civilians in the capital, Damascus, and in Homs in central Syria.