Two hospitals have been hit in new air strikes in northern Syria, medics and witnesses say, causing a number of deaths and injuries.

In Azaz, missiles reportedly killed at least 10 people, including several in one hospital building.

Medecins Sans Frontieres said eight staff members were missing after another attack in Maarat al-Numan.

The strikes come days after Russia and other world powers agreed to a limited cessation of hostilities in Syria.