A leading Mexican banker abducted more than three months ago was released by his kidnapers after his family paid a cash ransom of about $30 million. Alfredo Harp Helu, 50, president and a major stockholder in the banking-financial firm of Banamex-Accival, was freed on the south side of Mexico City. "I don't have any details. But, yes, he has been freed and he is safe and sound," a highly placed law enforcement source said. Harp Helu was kidnaped March 14. The kidnapers have not been identified.