In Syria's Aleppo, two neighborhoods under Kurdish control have been attacked by state forces, with videos showing people thrown from roofs and burned-out homes.

The Syrian army said it would push into the last Kurdish-held district of Aleppo city on Friday after Kurdish groups there rejected a government demand for their fighters to withdraw under a ceasefire deal.

The U.S. is facing a crisis as its two allies in Syria clash in Aleppo, the fiercest fighting yet between the government and Kurdish forces.

Fighting in the city of Aleppo resumed as talks to integrate the Kurdish-led Syrian Democratic Forces into the national military appear to have stalled.

Residents have started returning to a contested neighborhood in Syria's Aleppo after deadly clashes between government and Kurdish-led forces