aleppo talks watson lkl_00010619.jpg
al-Sham Legion
aleppo talks watson lkl_00010619.jpg
Now playing
05:04
Russia, Syria and Iran discuss Aleppo crisis
CNN
Now playing
02:12
'Too dangerous to do anymore': Sacha Baron Cohen on Borat
John Avlon 0413 Wallace
CNN
John Avlon 0413 Wallace
Now playing
03:31
Avlon compares Tucker Carlson's comments to George Wallace
screengrab hong kong oscars
IMDB / Field of Vision
screengrab hong kong oscars
Now playing
02:50
Hong Kong won't air Oscars for the first time since 1968
Now playing
01:27
See the first community of 3D-printed homes
Now playing
05:18
Anderson Cooper explains how he overcomes being shy
Burlington, MA Headquarters
Nuance
Burlington, MA Headquarters
Now playing
01:34
Microsoft to buy AI company Nuance
Now playing
02:50
Sleep doctor tells Anderson Cooper how long a power nap should be
WASHINGTON, DC - DECEMBER 01: Chairman of the Federal Reserve Jerome Powell testifies during a Senate Banking Committee hearing about the quarterly CARES Act report on Capitol Hill December 1, 2020 in Washington, DC.  Treasury Secretary Steven Mnuchin also testified at the hearing. (Photo by Susan Walsh-Pool/Getty Images)
Susan Walsh/Pool/Getty Images
WASHINGTON, DC - DECEMBER 01: Chairman of the Federal Reserve Jerome Powell testifies during a Senate Banking Committee hearing about the quarterly CARES Act report on Capitol Hill December 1, 2020 in Washington, DC. Treasury Secretary Steven Mnuchin also testified at the hearing. (Photo by Susan Walsh-Pool/Getty Images)
Now playing
02:06
Fed chief: The economy is about to grow more quickly
Christopher Hamilton
Now playing
01:01
Volcanologist shares what he prefers to cook on lava flows
"Saturday Night Live" / NBC
Now playing
01:47
'SNL' sees Minnesota news anchors take on the Derek Chauvin trial
Now playing
02:23
Pubs in England reopen after months of lockdown
DORAL, FLORIDA - AUGUST 27:  A Trump National Doral sign is seen at the golf resort owned by U.S. President Donald Trump's company on August 27, 2019 in Doral, Florida. President Trump said the United States may host the next G7 gathering at the golf resort. (Photo by Joe Raedle/Getty Images)
Joe Raedle/Getty Images
DORAL, FLORIDA - AUGUST 27: A Trump National Doral sign is seen at the golf resort owned by U.S. President Donald Trump's company on August 27, 2019 in Doral, Florida. President Trump said the United States may host the next G7 gathering at the golf resort. (Photo by Joe Raedle/Getty Images)
Now playing
03:46
'That is obviously false': CNN reporter on Trump supporter's attempt to rewrite history
Now playing
03:35
Why CrossFit CEO wants gyms included in infrastructure bill
Now playing
03:25
Camerota gives advice to Blackwell before they start new anchor roles
Fox News/Twitter
Now playing
01:33
ADL wants Fox News to fire Tucker Carlson over racist comments

Story highlights

Clashes are underway in government-held areas of Aleppo

At least 21 people were killed during intense fighting since Friday, rights group says

(CNN) —  

At least 21 people have been killed since Friday in tit-for-tat clashes between Syrian regime forces and rebels in the besieged city of Aleppo, the UK-based monitoring group Syrian Observatory for Human Rights (SOHR) reported.

The rights group said army forces, backed by Hezbollah militants and seeking to put down a new rebel offensive, on Saturday retook pockets of neighborhoods where rebel fighters a day earlier unleashed a series of deadly car bombings and mortar assaults.

The rebel offensive was repelled in part by renewed Russian and Syrian airstrikes targeting parts of west, south and southwest Aleppo, SOHR reported.

Opposition social media on Friday showed video of rebel tanks, armored personnel carriers, Grad rockets and artillery firing from the southwest of the city.

On Saturday, airstrikes and shelling in the Salaheddine neighborhood killed at least three people and wounded five others, according to SOHR. Rebels countered with intense shelling that wounded more than 12 people in regime-held positions in western parts of the city.

The city has long been divided between the government-controlled western section and the rebel-held pockets to the east.

There were conflicting reports on the number of casualties.

At least 21 people have been killed since Friday, including a woman and two children, as a result of rebel attacks, SOHR reported. SANA, the Syrian state news agency, reported at least 13 deaths as of Saturday.

At least six people were injured, including a child, when rebel shells rained down on the al-Hamadania and Salah-Eddin neighborhoods in Aleppo, a source at Aleppo Police Command said on Saturday.

SOHR reported intense fighting Saturday in western parts of the city.

Russia’s military had asked President Vladimir Putin for permission to resume airstrikes on the eastern part of Aleppo after a lull in fighting last week. But Putin said the resumption of airstrikes “would be inexpedient,” according to Kremlin spokesman Dmitry Peskov, who was quoted by the Russian state news agency Tass.

The rebel attacks come after Syrian government and allied Russian forces declared a unilateral ceasefire last week, which brought several days of relative calm following weeks of intense aerial bombardment.

But the ceasefire effectively ended Sunday when warplanes resumed bombing the city, according to residents.

The United Nations blames both sides in the conflict for failing to take advantage of the ceasefire to allow the evacuation of some of the hundreds of thousands of civilians believed to be trapped in eastern Aleppo.

The UN Under-Secretary-General for Humanitarian Affairs said on Wednesday that at least 400 people had been killed by Russian and Syrian government aerial bombardment of eastern Aleppo in less than a month.

Stephen O’Brien also told the UN Security Council that so far in October rebel mortar strikes have killed at least 100 people, including 17 women and 22 children.

Since the war began in 2011, an estimated 400,000 Syrians have been killed, according to the United Nations.

In the five years since the beginning of the civil war, over four million people have been forced to flee their homeland, according to estimates from the United Nations. Around 8.7 million more have been displaced internally and a ceasefire is the only hope for many who want to see an end to the ongoing violence.

There are four main factions of fighting groups throughout the country: Kurdish forces, ISIS, other opposition (such as Jaish al Fateh, an alliance between the Nusra Front and Ahrar-al-Sham) and the regime of President Bashar al-Assad.