Russia suspends airstrikes in some Syrian areas as truce goes into effect

Updated 2:30 PM EST, Sat February 27, 2016

Story highlights

NEW: Shelling reported in Damascus despite ceasefire

Russia halts airstrikes in some areas

Cessation of hostilities takes effect in Syria

(CNN) —  

The Russian military has halted airstrikes in areas of Syria as part of a cessation of hostilities agreement, state media reported Saturday. But sporadic violence between militants and some rebel groups was reported around the country – although it appeared to have diminished significantly.

Russia has stopped attacks on armed groups included in the temporary truce, defense ministry official Sergei Rudskoi said.

READ: The most dangerous group in Syria isn’t ISIS

Terrorist groups involved in the clashes, including ISIS and al Qaeda-linked al-Nusra Front, are not part of the truce agreement.

Multiple shells hit Syrian capital Saturday, the government-run news agency reported.

READ: Syria’s cessation of hostilities, explained

The shelling came from rebel-controlled neighborhoods in the capital, a military source told the news agency.

The source said the mortar shells came from the neighborhoods of Jubar and Duma, and called on Syrians living in those rebel-held neighborhoods to help stop the shelling.

READ: Syria’s war: How we got here

“We call on the residents of these neighborhoods to put pressure on these terrorists and do not give them the opportunity to spoil the efforts to return stability and security to these areas,” the military source told the news agency.

The London-based Syrian Observatory for Human Rights also reported the incidents of violence, but said things are quieter in general.

It said there were clashes between regime forces and rebels in Latakia, and other incidents of violence between government forces and ISIS fighters in Aleppo.

In Latakia, 12 rebel fighters were killed in clashes with government forces, according to the observatory.

ISIS, rebels clash

ISIS fighters also clashed with other rebel groups in Aleppo and Homs, the observatory said.

And ISIS used Twitter to claim responsibility for a suicide attack Saturday near the town of Salmiya, in Hama province.

The statement said the attack targeted regime forces gathering in Hama’s suburbs.

READ: In Syria, war crimes don’t take sides

Nevertheless, initial indications showed violence was significantly reduced – a relief to Syrians living in the rubble of bombed-out cities.

U.N. Special Envoy Staffan De Mistura said at a press briefing in Geneva that immediate reports indicated “suddenly both Daraa and Damascus had calmed down.”

An unusual quiet descended on major cities in Syria, said Rami Abdulrahman, director of the London-based Syrian Observatory for Human Rights, adding there were brief exceptions including some unexplained explosions reported in the north.

Nobody expects peace to settle over the nation overnight, De Mistura said.

If there are violations, he said, “the important point that we need to see is that if those incidents will be quickly brought under control and contained.

’Our best chance’

Another Syria task force meeting will take place Saturday afternoon in Geneva to assess whether the temporary truce is being respected, he said.

The cessation of hostilities is the most hopeful sign in years in the nation that’s been torn by civil war. At least 250,000 people have died and at least 1 million people have fled the nation.

Earlier Friday, the Security Council voted unanimously in favor of a resolution backing the halt in fighting and asking for all parties to abide by the terms of the cessation.

Meanwhile, a main Syrian opposition group said it will respect the two-week truce that starts with the cessation of hostilities but it warned the government and Russia not to target it under a pretense of attacking internationally recognized terror groups like ISIS.

CNN’s Nick Paton Walsh, Mohammed Tawfeeq and Alla Eshchenko contributed to this report.