Syrian Observatory for Human Rights said 12 Red Crescent volunteers and drivers had died in the strike
The US failed to help separate terrorists from the so-called moderate opposition, said Russia
The Russian president insisted Moscow is adhering to its part of the agreement
A barrage of rocket fire and shelling could be heard coming from the Jobar district, a rebel-held eastern suburb of Damascus
More than 86,000 civilians were among the 301,781 people killed, the Syrian Observatory for Human Rights said
Russia is to pressure Bashar al-Assad to obey the truce, while US will urge the rebel groups it supports to refrain from attacks
More than 290,000 people have been killed and over half the population displaced since the conflict began
At least 62 people, including 13 women and 13 children, were killed in Saturday's bombardment of Idlib city
Agreement was announced by the US Secretary of State, John Kerry, and his Russian counterpart Sergei Lavrov
In 1984 he was forced into exile for trying to overthrow his older brother, the late Syrian dictator Hafez al-Assad
It accused the rebels and their regional and international backers of carrying out gas attacks against Syria
Erdogan told Putin ovet the phone that it was essential to agree to a ceasefire in Aleppo "as soon as possible
Former Al-Nusra Front, renamed Fateh al-Sham Front, announced on Twitter death of commander Abu Omar Sarakeb
Rebel gunfire killed five people in Azamiyeh, a government-controlled area in Aleppo
The Islamic State claimed responsibility for the Hasakah bombing
The military forces recaptured all the military bases near the al-Ramuseh area south of Aleppo
Military college had fallen to the rebels last month as part of a wide-scale rebel offensive
Russian and American officials are holding negotiations in Geneva aimed at reestablishing a ceasefire in Syria
Russia has repeatedly denied using cluster bombs, which spray bomblets indiscriminately
Push for sanctions against Syria is expected to face resistance from Russia, Syria's ally