The weekend slaughter was caused by crudely made barrel bombs packed with explosives and dropped from helicopters on the city of Aleppo by forces loyal to President Bashar al-Assad.
Free Syrian Army fighters were powerless to protect women and children from the indiscriminate devices which left streets in flames.
An anti-Assad monitoring group, the Syrian Observatory for Human Rights, said the inaccurate bombs can collapse entire blocks of flats. Two months ago a similar raid on the suburbs is said to have claimed 500 lives.
Late on Saturday, a divided Syrian opposition narrowly agreed to join peace talks in Switzerland on Wednesday. Rebels have previously demanded the removal of Assad as a condition of discussions on a transitional government but he has said he has no intention of quitting.
More than 130,000 people have been killed and a quarter of Syrians driven from their homes in the conflict, which began with protests against 40 years of Assad family rule .
A shipment of just 200 food parcels was yesterday allowed through to Yarmouk, a camp of Palestinian refugees where 15 people have died of malnutrition under a seven-month siege.
UN Relief Works Agency spokesman Chris Gunness said the consignment would feed just 330 of the camp’s 18,000 residents for a month.
Britain has said Assad’s use of barrel bombs is “yet another war crime” which is clearly designed to terrorize civilians.
Photo: A child is pulled out from the rubble after raids by forces loyal to President Bashar al-Assad killed almost 200 people in Syria.