A dozen Syrian rebel factions have suspended talks on new peace negotiations, accusing President Bashar al-Assad's regime of violating a four-day-old ceasefire with attacks near Damascus that continued today. <br/><br/>In the northwestern province of Idlib, an air strike killed at least 25 members of former Al-Qaeda affiliate Fateh al-Sham Front, including senior figures.<br/>'<br/>The rebels' decision threatens the process sponsored by regime ally Russia and rebel backer Turkey, which began with a truce and is meant to lead to negotiations in the Kazakh capital Astana this month.<br/>'<br/>The ceasefire has brought quiet to large parts of the country but has been undermined by sporadic violence, particularly fighting in the Wadi Barada region north of Damascus that supplies the capital's water.<br/>