A D.C. government official and a business executive were arrested yesterday on bribery charges involving city technology contracts that included "ghost" workers and kickbacks... In court documents released yesterday, FBI agent Andrew Sekela laid out the complicated and audacious schemes allegedly orchestrated by a mid-level manager who approved many contracts involving the city government's technology needs... Yusuf Acar, 40, who has worked in the [Office of the Chief Technology Officer] since 2004, was charged with bribery, conspiracy, money laundering and conflict of interest. Assistant U.S. Attorney Thomas Hibarger told a federal judge that Acar is a flight risk because agents...