( CNN ) -- The stench of the burnt bodies was so potent , Abu Jafar said , he could smell it from 2 kilometers ( 1.2 miles ) away . `` It smells awful because the regime appears to have burnt so many bodies recently , '' the opposition activist said Sunday from the beleaguered city of Homs . `` Some cars arrived this morning and carried away dead bodies . We are not sure where . '' Read more : Deadly day in Syria as diplomats talk . Jafar 's account comes a day after what may be the deadliest day yet in Syria 's 21-month civil war , according to opposition figures . Lakhdar Brahimi , the joint U.N.-Arab League envoy , gave a dire warning Sunday on the rapidly deteriorating situation in Syria . `` If nearly 50,000 people have been killed in about two years , do not expect just 25,000 people to die next year -- maybe 100,000 will die , '' he told reporters in Cairo . `` The pace is increasing , '' he said . `` A solution is still possible , but it is only getting more complicated every day , '' Brahimi added . `` Had we dealt more carefully with this conflict in 2011 , it would have been much easier to resolve it . There is no question that it is much harder today . '' Read more : 'Til death do us part : Marriage destroyed by war . Brahimi met Sunday with Nabil Elaraby , secretary-general of the Arab League . On Saturday , Brahimi met with Russian Foreign Minister Sergey Lavrov . Russia and China have used their veto power in the U.N. Security Council to block some of the toughest resolutions proposed against the Syrian regime . Read more : Official : Russia invites head of Syrian opposition for talks . Traveling heavily in hopes of brokering a halt to the war , Brahimi said last week he is pinning his hopes on the formation of a transitional government in Damascus that would hold power until an election . At least 397 people were killed across the country Saturday , the opposition Local Coordination Committees of Syria said . At least 143 deaths were reported Sunday , including 10 children . The LCC said Saturday 's death toll included more than 200 people who were captured and `` field executed '' by Syrian soldiers in the Homs suburb of Deir Baalbeh after Syrian forces won a battle there . Read more : As Syria suffering spirals , envoy hopes for political transition . The group 's representative in Deir Baalbeh said he could only personally account for 27 deaths , but said a Syrian soldier who had been captured by rebels said government forces killed at least 200 people in the suburb . The group posted video of several men 's bodies lined up in a grassy field with wounds to the head , in what it claimed was footage taken by witnesses . Jafar said he believes Deir Baalbeh was targeted `` because it is the main gate to reach the Khaldiya neighborhood , which has been under the control of the rebels . '' Syrian state-run TV confirmed there was conflict in the area but said that government forces had been chasing down `` terrorists . '' News footage showed bodies that appeared to have been dragged across the floor in a building , leaving long trails of blood behind . Read more : U.S. officials : Syria using more accurate , Iranian-made missiles . The news report said forces had killed `` several terrorists '' in the Deir Baalbeh area . The government frequently refers to rebels seeking to overthrow President Bashar al-Assad as `` terrorists . '' But another opposition activist in Homs , Hadi Abdallah , said the situation in nearby Deir Baalbeh `` is only turning from bad to worse . '' `` Smoke is rising from Deir Baalbeh this morning , and a stench is coming out of some of its streets due to the burning of some corpses by the regime forces , '' Abdallah said Sunday . `` What is noticeable in the bodies we found yesterday and today in Deir Baalbeh is that they appear to have been slaughtered at the neck and then burned , including women and children . Others appear to have been killed from knife and bullet wounds . '' Read more : Syrian military police chief defects to join 'the people 's revolution ' Syria 's state-run news agency SANA said Sunday that the military has been killing many terrorists . One army unit `` killed several terrorists and injured many others '' and destroyed launchers of locally made missiles that the terrorists had used to attack orchards in the Maartamasrin area in Idlib province , SANA reported . CNN can not independently confirm casualty and other reports as Syria 's government has severely restricted access to the country . CNN 's Hamdi Alkhshali contributed to this report .
NEW : At least 100 people were killed Sunday , a Syrian opposition group says . Syria says its military killed terrorists who were attacking orchards . Saturday should have been the deadliest day of the year . There will be 100,000 deaths in Syria next year , envoy says .