The civilians, including a dozen people at a busy market, were killed in the rebel and opposition-held Idlib since Tuesday midnight, the Syrian Observatory for Human Rights says.
The talks are being seen as the most promising yet between the warring parties after Taliban co-founder Mullah Abdul Ghani Baradar joined for the first time, flying in from Pakistan.
Pakistan's information minister Chaudhry Fawad Hussain says his government entered into a deal with the hardline protesters to avoid violence sparked by a top court order that acquitted a Christian woman Asia Bibi of blasphemy charges.
Unknown attackers killed the prominent cleric, who runs an Islamic school in northwestern Pakistan, his deputy Yousaf Sha and nephew said.
The United Nations, which has been supporting the process, has urged Afghans to "use this opportunity to exercise their constitutional right to vote" and called for the election to take place in a safe and secure environment.
Pakistan's law minister Zahid Hamid resigned after a previously lesser-known religious party struck a deal with the help of the military to end a weeks-long protest against blasphemy.
Dr Ibrahim Kalin spoke with TRT World and said the changes proposed in the April 16 referendum will strengthen accountability and "checks and balances," while also giving power to the parliament over the president.
The predominantly Kurdish province of Diyarbakir in the country's southeast is divided between "yes" and "no" voters. Sunday's referendum offers citizens in Diyarbakir a chance to have their voices heard.
Millions of people are expected to vote on April 16 in a referendum on Turkey's constitution to decide whether the country should become a presidential republic.
Low oil prices force the oil and gas-rich country to search for alternatives, like investing in tourism and infrastructure to diversify its economy.
Stage II of the Shah Deniz gas field will provide more options to Europe to lessen its energy reliance on Russia.
Years of tension and sporadic violence in the Nagorno-Karabakh region between Azerbaijan and Armenia has displaced tens of thousands of people. Many hope to go home one day.
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