The chief executive and a managing partner of the collapsed Dubai private equity firm Abraaj Capital Ltd have been arrested on U.S. charges that they defrauded their investors, including the Bill & Melinda Gates Foundation, Reuters reported. Abraaj founder and Chief Executive Arif Naqvi was arrested in the United Kingdom last Friday, while managing partner Mustafa Abdel-Wadood was arrested at a New York hotel on Thursday, Assistant U.S. Attorney Andrea Griswold said at a hearing in Manhattan federal court. Griswold said that prosecutors would seek to have Naqvi, who is charged with the same crimes, extradited. Casey Larsen, a spokesman for Naqvi, could not immediately be reached. Abdel-Wadood appeared at the Manhattan hearing and pleaded not guilty to securities fraud, wire fraud and conspiracy charges. His lawyer, Benjamin Brafman, did not immediately request bail, saying he needed more time to become familiar with the case.