A new ceasefire in Syria brought a full day with no combat deaths in the war between President Bashar al-Assad and his opponents, a monitoring body said on September 13, as efforts to deliver aid to besieged areas got cautiously under way.
A nationwide ceasefire in Syria brokered by the United States and Russia went into effect on September 12 evening, the second attempt this year by Washington and Moscow to halt the five-year-old civil war.
Government troops and insurgents fought in several parts of Syria on September 11, apparently seeking to strengthen their positions on the eve of a ceasefire that Free Syrian Army rebels said they would observe but with major reservations.
The United States and Russia hailed a breakthrough deal on September 10 to put Syria's peace process back on track, including a nationwide truce effective from sundown on September 12 improved humanitarian aid access and joint military targeting of banned Islamist groups.
US Secretary of State John Kerry will meet Russia's foreign minister in Geneva about a ceasefire deal for Syria, the State Department said on September 8 in a sudden about-face after saying it did not believe a meeting was worthwhile.
Turkey's military said on September 8 it had taken control of four residential areas in northern Syria as it presses an offensive to sweep Islamic State out of a patch of border territory and prevent Kurdish militia fighters gaining ground in their wake.
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An Iraqi Shi'ite militia said on September 7 it had dispatched more than 1,000 fighters to the frontline in neighboring Syria, escalating foreign involvement in the battle for Aleppo, the biggest prize in five years of relentless civil war.
Saudi Foreign Minister Adel al-Jubeir said on September 6 there was a possibility of reaching an agreement on a ceasefire in Syria within 24 hours.
The United States and Russia will work in the next few days on a deal to curb fighting in Syria and build cooperation in the fight against terrorism, their leaders said on September 5, as blasts claimed by Islamic State killed dozens across the Arab nation.
Turkish-backed rebels on September 4 cleared Islamic State from Turkey's Syrian border, securing a 90 km (55 miles) corridor and marking a substantial gain in Ankara's plan to drive out Sunni militants and stop the advance of Syrian Kurdish fighters.
Turkey and its rebel allies opened a new line of attack in northern Syria on September 3, as Turkish tanks rolled across the border and Syrian fighters swept in from the west to take villages held by Islamic State.
Turkey wants to clear Islamic State from a 90-km (56-mile) stretch of territory on the Syrian side of its border, a week after it launched an incursion that has strained ties with the United States.
Islamic State said on August 30 one of its most prominent and longest-serving leaders was killed in what appeared to be an American air strike in Syria, depriving the militant group of the man in charge of directing attacks overseas.
The Obama administration will meet its goal of admitting 10,000 Syrian refugees this fiscal year a month ahead of schedule and is working with Congress to increase the target by a few thousand in 2018, the White House said on August 29.
Turkey's army and its allies thrust deeper into Syria on August 28, seizing territory controlled by Kurdish-aligned forces on the fifth day of a cross-border campaign that a monitoring group said had killed at least 35 villagers.
US Secretary of State John Kerry arrived in Geneva on August 25 to try to finalize details of a deal with Russian Foreign Minister Sergei Lavrov on military cooperation and intelligence sharing in Syria.
Iraq's Prime Minister Haider al-Abadi held talks on August 25 with visiting Syrian Foreign Minister Walid al-Muallem about securing their common border after a partial retreat by Islamic State militants.
Syrian rebels backed by Turkish special forces, tanks and warplanes entered one of Islamic State's last strongholds on the Turkish-Syrian border on August 24, in Turkey's first major U.S.-backed incursion into its southern neighbor.
The Russian military said on August 22 its aircraft operating from an Iranian air base to conduct strikes in Syria had completed their tasks, but left open the possibility of using the Hamadan base again if circumstances warranted.