Mogadishu - Witnesses say that hundreds of gun-toting al-Shabaab fighters have moved back into central Somali towns abandoned over the last week by Ethiopian troops.
Ali Muhyadin, a resident in the town of El-bur, said on Tuesday that residents woke up on Sunday and found that Ethiopian troops had abandoned their bases.
Residents said al-Shabaab fighters then beheaded two men accused of collaborating with the Ethiopians and dumped their headless bodies in town.
Al-Shabaab was reported to have returned to two other towns - Mahas and Wabho - after Ethiopian troops left.
Ethiopia's president recently promised that Ethiopian forces would leave Somalia soon.
Ethiopian forces still occupy the larger towns of Baidoa and Beledweyne.