LIVE: Deadly clashes erupt between Syrian army, SDF forces in Aleppo

At least three civilians and a Syrian soldier have been killed after clashes erupted between the Syrian army and the Kurdish-led and US-backed Syrian Democratic Forces (SDF) in Aleppo, according to the state news agency SANA. Earlier, Syria's defence ministry said three soldiers were injured after SDF fired drones at a military checkpoint near Deir Hafer, east of northern province. Heavy machine gunfire and fighting have been reported in the areas of Sheikh Maqsoud and Ashrafiyah. The ministry says it will respond to the "aggression in an appropriate manner".