Fierce confrontation in Hasaka town after Russian mediation efforts fail.

Some diplomats doubt Moscow might use pause for strategic advantage.

Amnesty report gives chilling account of rights abuse by Assad government.

More than 25 fighters killed and 25 others wounded near Atmeh border.

U.N. chief says if proven chlorine attack would amount to war crime.

Russia announced on Wednesday that it will stop all military hostilities, aviation strikes and artillery strikes on Syria’s Aleppo for three hours daily to allow humanitarian convoys to enter the rebel-held parts of the city.

Rebel alliance vowed to launch a major offensive to retake entire city.

Rebel coalition plans to double the number of fighters for major offensive.

Thousands of Syrians stranded after Jordan sealed off border in June.

Violence intensified around Aleppo as rebels launched a major offensive and blew up key army positions to break a government siege on the war-torn city on Wednesday.