Fighting intensified on Thursday between Syrian government troops and Kurdish fighters in the northern city of Aleppo, with a fierce exchange of fire extending into the night and rescue workers scrambling to put out fires ignited by the shelling. Plumes of smoke rose above the city skyline at dusk and the boom of artillery could be heard across Aleppo as the Kurdish fighters tried to repel the troops’ advance and cling to neighbourhoods under their control. The fighting, which erupted on Tuesday, has driven more than 140,000 people from their homes and left at least seven civilians dead, according to Syrian authorities. The deadly stand-off between Damascus and Kurdish authorities, who have resisted integrating into the central government, is a major challenge for Syrian President Ahmed al-Sharaa, who has pledged to unite the country after 14 years of civil war. Stalled talks on ceasefire Syria’s army gave a window on Thursday for residents to evacuate the neighbourhoods held by Kurdish forces in Aleppo befor...