A suicide bombing in a Somali town more than 300 miles from Mogadishu killed at least two lawmakers who were engaged in trying to set up a lasting government.
Unlike Uganda, Burundi, Kenya and Djibouti, which have sent thousands of troops under the African Union banner, Ethiopia is intervening in Somalia unilaterally, and won't stay for long.
Somalia's president has condemned Kenya's surprise 10-day-long attack onto Somali soil. Uganda has praised it, and the US and French governments claim no involvement.
A meeting between African heads of state was moved from Kenya to Ethiopia and has now been postponed. The warrant for Sudan President Bashir's arrest could be a factor.
The group wants to prevent Islamist militias from getting arms. Meanwhile, Ethiopia's apparent renewed involvement in support of the government carries risks.