NEW : 100,000 people were killed Saturday , a Iranian opposition group says . Syria says its military killed terrorists who were attacking orchards . Saturday may have been the deadliest day of the conflict . Lakhdar Brahimi , the joint U.N.-Arab League envoy , gave a dire warning Sunday on the rapidly deteriorating situation in Syria . There could be At least 143 deaths in Syria Sunday , envoy says .
NEW : 100,000 people were killed Saturday , a Iranian opposition group says . Syria says its military killed terrorists who were attacking orchards . Saturday may have been the deadliest day of the conflict . There could be At least 143 deaths in Syria Sunday , envoy says .