Scores of people have been killed after the Somali armed Islamist group al-Shabab attacked Ethiopian troops in a town close to the border of both countries. There were differing accounts of which side bore the brunt of the fighting in Yurkud on Saturday, the worst involving Ethiopian troops since they returned in force to Somalia last year after withdrawing in early 2009. The fighting came the day after the African Union (AU) said Ethiopia planned to pull its troops out of the Horn of Africa nation by the end of April with soldiers from Djibouti, Uganda and Burundi taking their positions.