At least 12 people were killed and 27 others wounded when a suicide bomber rammed a vehicle packed with explosives into an African Union convoy near Afgoy, southwest of the Somali capital Mogadishu, a local governor said. The attack, the latest in a wave of violence, comes exactly one week after a US air strike killed the chief of the al-Qaeda-linked al-Shabab group, prompting threats of retaliation from the group. Speaking to Al Jazeera, al-Shabab's military operations, spokesman claimed responsibility for the attack that took place near the town of Afgoye, about 30km northwest from the capital Mogadishu. Governor Abdukadir Mohamed Sidi said a car packed with explosives hit one of the armoured AU trucks. ‘Twelve civilians in a minibus were killed, and 27 others were wounded,’ he told the AFP news agency.