Fighting between Somali Islamists and interim government forces has escalated in recent days. After a background report, Ray Suarez talks with two experts about the reasons for the conflict and the possibility of it enveloping the Horn of Africa region.

Ethiopian troops in Somalia to defend the country's embattled government exchanged heavy gunfire with Somali Islamist forces Wednesday, a day after an Islamist deadline passed demanding that the Ethiopians leave or face war.