<p>Federal prosecutors investigating the Oil-for-Food scandal are focusing on a growing number of current and former U.N. officials, court documents show. Among those under scrutiny: ex-U.N. secretary-general Boutros Boutros-Ghali and his aides. The documents were released last week along with criminal charges filed against South Korean businessman Tongsun Park, accused of receiving $2 million in secret payments from Iraq to lobby on Oil-for-Food. Some of the money, the Feds say, was to be used to "take care" of a senior U.N. official. Park also allegedly invested Iraqi money in a company owned by an "immediate family member" of another U.N. official. Investigators say a key event in the alleged scheme was a June 1993 meeting in Geneva between "U.N. Official #1" and two Iraqis. News reports show that a critical meeting on Iraq was held in Geneva at that time between Saddam Hussein sidekick Tariq Aziz and Boutros-Ghali. U.N. sources say this doesn't prove Boutros-Ghali's involvement. Boutros-Ghali couldn't be reached for comment; Park's lawyer says his client denies wrongdoing.</p>