(CNN) – Heavy gunfire reverberated in central Cairo before dawn Thursday as supporters and foes of embattled Egyptian President Hosni Mubarak continued to face off at Tahrir Square, where chunks of concretes and Molotov cocktails were employed as weapons in the escalating crisis. CNN personnel saw wounded people being carried into Tahrir Square, largely held … Continue reading Egypt a 'heartwrenching' and 'complex' diplomacy issue for U.S.