NEW : The opposition reports 78 killed , most in Idlib . A new round of peace talks between the Syrian government and rebels is set to begin on Monday in Geneva. The threat to execute terrorists is a major escalation against protesters . The United Nations estimates that about 5,000 have died in Syrian violence this year .
NEW : The opposition reports 78 killed , most in Idlib . Monday 's toll may be worst of the uprising to date . The threat to execute terrorists is a major escalation against protesters . The United Nations estimates that about 5,000 have died in Syrian violence this year .