(Reuters) -Chaotic scenes unfolded in the eastern Congo city of Bukavu on Saturday after Rwanda-backed M23 rebels reached its outskirts, while a threat by Uganda's army chief to attack a Congolese town raised fears of the conflict flaring into a wider regional war.

Panic and looting are sweeping through eastern Congo’s second largest city as residents fled by the thousands to escape the looming advance of Rwanda-backed rebels.

Chaotic scenes have been unfolding in Bukavu in eastern Democratic Republic of Congo as the M23 rebel group continues its offensive in the region. On Saturday there were reports of sporadic gunfire and widespread looting in the city, including at a World Food Programme depot, with residents sheltering in their homes.