MOGADISHU : At least six people were killed and many wounded Thursday in a suicide car bomb attack targeting a United Nations convoy close to Mogadishu’s heavily-fortified international airport, officials said.Somalia’s Al-Qaeda-linked Shebab rebels told AFP that one of their suicide bombers carried out the attack.The bomb went off near a checkpoint at the entrance to the airport complex, which also houses the base of AMISOM — the African Union force fighting Shebab rebels — as well as a number of foreign diplomatic missions and United Nations offices.A statement from UNSOM, the UN mission in Somalia, said the bomb went off near a convoy of UN vehicles shortly after midday.“A UN car was damaged but no UN staff were injured. Four Somali security escorts were lightly injured,” UNSOM said, expressing “deep sorrow at the reported deaths and injuries of Somali bystanders.”“At least six people, most of them civilians, died in the car bomb explosion. There are many casualties, serious injuries. We are still investigating the incident, the toll could rise anytime,” a Somali police official, Said Mohamed, told AFP.A Shebab spokesman claimed reponsibility for the attack.“This was an operation carried out by Shebab. It was a brother who took a sacrificial act to defend the people of Somalia,” Shebab military spokesman Sheikh Abdul Aziz Abu Musab told AFP.“The target was a UN convoy. According to our report, several invaders have been killed,” he said.Another witness told an AFPTV journalist at the scene that as many as 14 people may have been killed and saw six others being taken away to hospital. An AFP photographer at the scene saw the burning wreckage of a vehicle and several destroyed shops.The airport is considered to be among the safest parts of Mogadishu, and is ringed by checkpoints and large numbers of armed guards.A number of foreign diplomatic missions are based inside the huge airport complex, which has also been used to house a number of UN staff since a city-centre UN compound was attacked by the Shebab last year.Britain’s ambassador to Somalia Neil Wigan, whose embassy is within the high-security airport complex, said on Twitter that he had heard a “major explosion” that sent smoke into the air.The attack comes amid an apparent upsurge of Shebab bombings in and around Mogadishu. Earlier this week the group carried out twin bombings inside the city, targeting government officials.The Shebab once controlled most of southern and central Somalia but withdrew from fixed positions in the ruined coastal capital two years ago.African Union troops — including large contingents from Uganda, Kenya and Burundi — have since recaptured every major insurgent bastion and tried to prop up Somalia’s fledgling government forces.But a string of devastating Shebab attacks against foreign and government targets have shattered hopes of a rebirth for the war-ravaged capital and demonstrated that the Islamist outfit’s disruptive power was undiminished.