In Syria, at least 20 people were killed and several others injured in a car bomb attack in northern province of Aleppo. <br/><br/>The blast hit an opposition checkpoint run by a rebel group near the town of Azaz, close to the border with Turkey. According to the UK-based Syrian Observatory for Human Rights, the death toll is likely to rise because of the number of people with serious wounds. <br/><br/>The Islamic State group has regularly targeted rebel factions with bomb attacks. More than 300,000 people have been killed in Syria since the conflict began with anti-government protests in March 2011.<br/><br/>Meanwhile, top diplomats from the United States, Russia, and the Middle East will attempt to salvage a failed Syria cease-fire agreement tomorrow with talks in Lausanne, Switzerland, followed by a separate meeting on Sunday in London.