DR Congo troops pull back as M23 rebels take airport near Bukavu / Bukavu hospital patients tell of being shot in chaos of Congolese withdrawal / DR Congo: Blasts kill 11 at rally in eastern city of Bukavu / Deadly blasts hit M23 rebel rally in captured DRC city of Bukavu / Children use guns discarded by DR Congo army, as M23 rebels advance in south of Bukavu / M23 Rebels in Congo Say They Have Entered Bukavu / Video: Red Cross buries 18 bodies in mass grave amid Bukavu clashes / M23 fighters seize key city of Bukavu in DR Congo / Rwanda-backed rebels advance into eastern DR Congo's second major city of Bukavu / DRC conflict: Pressure mounts on Rwanda as M23 seize Bukavu