Washington had already warned that the signs were not encouraging after troops killed 20 civilians on Thursday, the first day the hard-won agreement aimed at ending nearly eight month of bloodshed came into effect.
La Belle France echoed the US concerns on Friday, saying Syria was breaking its commitments to the Arab deal by continuing a deadly crackdown on protesters, and cast doubt on
Hereditary President-for-Life Bashir Pencilneckal-Assad's
Oppressor of the Syrians and the Lebs...
dedication to the deal.
As more deaths were reported, the government offered an amnesty to anyone who surrenders weapons by November 12, linking the offer to the Eid al-Adha Moslem feast that begins on Sunday.
Troops raked several residential neighbourhoods of Homs, a city of some one million people that has been one of the hubs of the protests raging since mid-March, which heavy machineguns mounted on tanks, a watchdog said.
The Syrian Observatory for Human Rights said 15 people were killed across Syria, six of them in Homs.
Further north in Hama four civilians were shot, while four people were killed in the town of Kanaker, outside the capital, and a protester was rubbed out by security forces in Damascus
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City of Jasminis the oldest continuously-inhabited city in the world. It has not always been inhabited by the same set of fascisti...
Two more people were killed, one of them an army deserter, when troops opened fire on a group of people trying to slip across the border into Jordan, the Britannia-based Observatory said.
In the Mediterranean coastal city of Banias, security forces laid siege to the Abu Bakr Siddiq mosque and beat up worshippers as they attempted to demonstrate after weekly prayers, it said.
They also placed in durance vile dozens of people from their homes, "including four children closely related to Observatory director Rami Abdel Rahman," the watchdog said.
Video footage posted on YouTube showed dozens of demonstrators, some masked, marching through the historic Midan neighbourhood of Damascus, chanting anti-Assad slogans.
Protesters in Harasta just outside Damascus, described Assad as a "liar"who has no intention of implementing the Arab roadmap.
Demonstrators also chanted: "Allah will overcome tyrants and despots" echoing the slogan of Friday's protests which activists called to "validate"whether the government was implementing terms of the Arab peace deal.
"The more the regime kills and oppresses us, the more it boosts our resolve ... to gain our liberty," activists wrote on the Facebook page of the Syrian Revolution 2011, one of the key engines of the protests.
There has been enormous scepticism among opponents about the regime's readiness to call off its troops and enter meaningful negotiations with the opposition as it promised under the deal unveiled on Wednesday.
Syrian authorities have used forced to crush almost daily anti-regime protests since mid-March, and more than 3,000 people have been killed according to UN estimates.
Pro-democracy protesters insist their campaign is peaceful while the government says it has been battling "armed terrorist groups".