Dozens of people were killed in a series of air strikes on the city of Raqqa in northern Syria on Saturday, a monitoring group and activists said, as Damascus and Moscow waged attacks.

A cessation of hostilities in Syria took effect three weeks ago, reducing violence but not halting the fighting as peace talks take place in Geneva.

Russia has been pulling out its attack aircraft after announcing a partial withdrawal from Syria.

The Britain-based Syrian Observatory for Human Rights said that at least 39 people had been killed and dozens more wounded in the raids on Raqqa.

An activist group with sources in Raqqa, called Raqqa Is Being Slaughtered Silently, said more than 40 had been killed, and that separate strikes hit areas in the north of Raqqa province.

The Observatory said the dead included seven women and five children. It said it was not clear whether Syrian or Russian warplanes had conducted the air strikes.

Separately, Russian warplanes hit the city of Palmyra and its immediate vicinity with some 70 air strikes, the Observatory said, killing at least 18 people.

Regime forces and their allies are aiming to capture Palmyra, some 200 km southwest of Raqqa held by ISIS since May.

PHOTO CAPTION

Farmers gather crops in Tel Abyad town on the Syrian-Turkish border, Raqqa countryside, in this September 24, 2014 file photo.

Reuters