Heavy air strikes pounded southern areas of Sudan's capital on Thursday as clashes flared near a military camp, witnesses said, in fighting that has displaced nearly 1 million people and left residents of Khartoum struggling to survive. Air strikes by the army targeting the paramilitary Rapid Support Forces (RSF) were heard across several residential neighbourhoods in southern Khartoum, including near the Taiba camp, while a police reserve force aligned with the army battled the RSF on the ground, the witnesses said.