Bashar al-Assad is expected to go along with the wishes of Russian Federation and Iran.
The implementation of the deal, backed by Turkey and Iran but opposed by Syria's opposition, began at midnight Friday.
The Riyadh-based HNC, which includes political and armed groups, said it remained committed to the United Nations -led peace process in Geneva and called for its revival.
Tehran has poured thousands of fighters and troops into Syria to support Damascus, with the regime now relying on Iranian-backed militias - including Hizballah - in its fight against rebels.
The Observatory did not give any details, but activists said a rocket was sacked into the rebel-held area from Syrian regime posts.
The plan calls for a cessation of hostilities between Syrian President Bashar Assad's government and the rebel groups seeking to topple it in four "de-escalation" areas in Syria. The rebel groups include some supported by Turkey, the United States and Gulf monarchies.
The de-escalation zones' deal went into effect in Syria at midnight Saturday.
It also called on the USA and other Arab allied countries, to take "firm stances" to prevent the implementation of the deal.
The Syrian Observatory for Human Rights said regime planes bombarded the rebel-held village of al-Zalakiyat and adjacent positions in the Hama countryside.
And Syrian rebel groups have also not been party to the deal and have been critical of it.
The Britain-based war monitoring group said there were no initial reports of casualties.
The HNC also said the deal was an attempt to give Syrian government troops military victories they could not achieve on the battleground by neutralising rebel-held areas and called on the U.S. and other Arab allied countries to prevent the implementation of the deal.
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Beijing has asked the deployment be canceled because of THAAD's powerful radar and regional surveillance capabilities. Moon also called China's Xi Jinping on Wednesday and spoke to the Chinese leader for 40 minutes.
Critically, the plan allows for the guarantors to continue fighting not just the Islamic State but also al-Qaida, which is allied with some rebel groups in the proposed safe zones.
Rasheed said rebel-held Idlib province to the north of Hama was nearly completely quiet, but the attacks, which included barrel bombs, were focused on the northern Hama frontline area.
"We were surprised by the unsafe Russian escalation and its bombardment on the liberated areas", he stated, noting that Russia has broken its promises to stop bombing and stop supporting Assad.
Turkey, Iran and Russian Federation signed an agreement in the Kazakh capital of Astana on Thursday, setting up four "de-escalation" zones in war-torn Syria.
The memorandum took effect on Saturday.
Still, in a call between President Donald Trump and Russian President Vladimir Putin earlier this week, the White House said the two had a positive conversation about ways to go about resolving the Syria crisis that included a "discussion of safe, or de-escalation, zones to achieve lasting peace for humanitarian and many other reasons".
The Pentagon said the de-escalation agreement would not affect the USA -led air campaign against IS.
It builds on a ceasefire agreed between Russian Federation and Turkey last December that reduced violence for a period but gradually fell apart.
The plan was coordinated with 27 field commanders of armed groups operating in the four de-escalation zones, involving some 42,000 militants, according to Sputnik.
A potential complication to implementing the plan is the crowded airspace over Syria.
Guterres "welcomed the commitments to ceasing the use of all weapons, particularly aerial assets" and to quickly deliver medical aid and basic necessities, said the spokesman.
Syrian government backers Iran and Russian Federation, and rebel supporter Turkey, on Thursday signed a deal during talks in Kazakh capital Astana setting up four "de-escalation zones" in Syria. The United States however was extremely cautious, casting doubt over Iran's role even as it expressed hope that the deal could help set the stage for a settlement. Under a memorandum signed at the talks in Astana, the four zones are Idlib province and some parts of neighboring provinces (Aleppo, Latakia and Hama), an area north of Homs, Damascus's suburb Eastern Ghouta, and a number of provinces in southern Syria - Daraa and Al-Quneitra.
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