"Then he needs to stop and let the joint implementation center get set up so Russian Federation and the United States can coordinate in order to avoid the kind of awful thing that happened yesterday that we all acknowledge and regret".

Under the US-Russia deal, if the truce lasts seven days and humanitarian access is granted, Moscow and Washington are to work together to target jihadists including the Islamic State group (IS).

The Syrian opposition reported Monday 254 violations by government troops and their allies since the truce started.

The State Department said it was prepared to extend the cease-fire window in the hopes that if it held, the USA and Russian Federation could then turn to their planned military cooperation against the Islamic State militants and al-Qaida-linked groups in Syria.

- Damascus fighting - ===================== Since September 12, a total of 26 civilians, including eight children, have been killed in areas where the truce had been set to take hold, according to the Syrian Observatory for Human Rights.

A Syrian activist group said 92 people have been killed in Syria since the start of the cease-fire.

The first would reach the rebel-held town of Talbisseh, where at least two people were killed by shelling during the truce.

Fares al-Bayoush, the head of another rebel group operating in northern Syria under the western-backed Free Syrian Army umbrella, told Reuters "the truce in its current state can not be continued". He claimed on Monday that the Syrian government forces have observed the truce unilaterally, despite the continuing rebel violations. The U.S. military said they meant to target so-called Islamic State (ISIS) group positions. George Sabra, of the opposition High Negotiations Committee, told the Associated Press on Monday that the truce has repeatedly been violated and did not succeed in its primary objective: Humanitarian aid for both parties.

The US and Russian accord had sought to bring seven days of calm and fresh relief to civilians in the besieged city of Aleppo. The station said the airstrikes targeted IS positions in areas such as the Tharda Mountain, which overlooks the airport of the city of Deir el-Zour. Russian Federation accused the US of threatening the cease-fire, calling the future of the deal "a very big question mark".

French aircraft carrier rejoins US-led fight against IS
The offensive marks the third anti-terrorist operation in which the Charles de Gaulle has taken part since February 2015. Sep 30, 2016- France has begun air operations over Iraq from the aircraft carrier Charles de Gaulle, reports say.

On Monday, the Ministry of Defence in London confirmed that the British aircraft - believed to be unmanned, remotely-piloted Reaper drones - had been involved in the strike, along with jets from Australia and Denmark.

The air strike on a Syrian army position by the US-led coaltion on Saturday triggered a fierce war of words between Washington and Moscow, with Russian Federation saying it put the agreement under threat.

The United Nations did not confirm the casualties cited by the Syrian Observatory for Human Rights and said they were investigating the reports.

The security council was set to discuss whether or not to endorse the Syria cease-fire agreement, but Russian Federation and the United States, who orchestrated the deal, reportedly could not agree on which particulars to present.

While the U.S. said the strike was an accident, Russia's Foreign Ministry spokeswoman Maria Zakharova said it was evidence the USA was ready to back even Islamic State to further its goal of regime change in Syria.

Dozens of Syrian soldiers were killed during an airstrike by the United States in Syria. President Barack Obama has made clear the US will use military force only against IS and other extremist organizations, and not against Syrian President Bashar Assad's government.

Recep Tayyip Erdogan says the Syrian opposition forces, backed by Turkish troops and tanks, are determined to advance toward al-Bab to clear the region of terror threats.

The UN aid chief said an aid convoy destined for rebel-held eastern Aleppo was still stuck in Turkey.