The AP has reported that Somali pirates have released an oil tanker that they hijacked a month ago on its way from the United Arab Emirates to South Africa, a maritime official said Sunday. The MT San Carlo is now on its way to South Africa, said Andrew Mwangura, head of the Kenyan chapter of the Seafarers Assistance Program. It was not immediately clear whether a ransom was paid for the release of the Malta-registered vessel and its crew of 24, Mwangura said. Several pirate groups operate along Somalia's 1,880-mile coastline, Africa's longest. The Horn of Africa nation has had no effective government since opposition leaders ousted a dictatorship in 1991 and then turned on each other, leaving the nation of 7 million a patchwork of warlord fiefdoms. On Nov.