Thirteen died in Homs, two in Jasem, in Daraa, and two in Madamiah, near Damascus.
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Other deaths occurred in the provinces of Idlib, Homs, Daraa, Deir Ezzor, and Aleppo.
It also said an "armed terrorist group" killed a Daraa citizen out buying bread.
Some 59 of those fatalities were in and around Damascus, with another 28 in Daraa province.
Twenty-six of the deaths were in Homs and 20 were in Daraa, the LCC said.
Government forces executed 14 people in Daraa hours after they were detained, the opposition network said.
Some 18 of the 27 killed in Daraa were "executed in the field, " the group said.
People have fled Damascus and its suburbs as well as Daraa in recent days as fighting persists.
American aid means medicine and treatment for hundreds of thousands of patients in Damascus, Daraa and Homs.
Another 30 were killed in Deir Ezzor, 27 in Daraa (mostly in Hirak) and 26 in Aleppo.
Twenty of those 80 were killed in Daraa, while 17 were killed in Deir Ezzor, the group said.
And the Observatory said the Syrian army shot and killed a man in the southern city of Daraa.
Student demonstrators also turned out at Deir Ezzor University, the Daraa branch of Damascus University and other towns.
There are now reports of mass graves near the town of Daraa and other places in the country.
Heavy shelling rocked other cities, including Damascus, Daraa, Idlib and Homs, the Local Coordination Committees of Syria said.
The Local Coordination Committees reported helicopters dropped phosphorus bombs over the town of Khirbet Ghazaleh in Daraa province Saturday.
Opposition activists reported at least 75 more deaths on Wednesday amid heavy fighting in and around Damascus and Daraa.
Daraa is where the anti-government uprising got going more than two years ago.
Multiple attacks targeted towns in Idlib province in the north and in Daraa province bordering Israel, Jordan and Lebanon.
Daraa, one of the major Syrian cities engulfed in violence, is near Jordan.
In Daraa province, forces fired at protesters to disperse them, said the Local Coordination Committees of Syria, another opposition group.
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By the end of Saturday, 115 people were killed in Syria, including 12 in Daraa, the Local Coordination Committees said.
State TV said military forces conducted operations around Damascus and in the provinces of Hassaka, Daraa, and Idlib and Aleppo.
Daraa province, where the conflict began in March 2011 as peaceful anti-government demonstrations, has suffered heightened violence in recent days.
To date, only four of Syria's 14 governorates constitute the major hubs of the protest movement: Homs, Hama, Idlib and Daraa.
Four armed military defectors died as in clashes with regime forces in Daraa province, the Syrian Observatory for Human Rights said.
There were more than 500 fatalities in the provinces of Idlib, Homs and Daraa during Ramadan as well, the LCC reported.
Civilians were killed when Syrian forces used air cover to storm the city of Sanamein in Daraa province Wednesday, the opposition said.
There were also five reported fatalities in Beit Jin outside Damascus, two in Daraa, two in Deir Ezzor and one in Aleppo.
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Monday's violence included house-to-house raids and arrests in Daraa and "very intense shelling" in Homs, with helicopters flying overhead, the LCC said.
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