NEW YORK - The news media group Newsweek was in turmoil this week amid the firing of its top editorial staff , reportedly for investigating the finances of their own company. Veteran reporter Matthew Cooper announced his resignation late Monday, saying the firing of top Newsweek editors was a "disgrace" and a sign of "reckless leadership" at the New York media group with the brand of the onetime leading news magazine. Another prominent journalist, David Sirota, quit on Tuesday, announcing the move on Twitter. "I am resigning from IBT/Newsweek. I am proud of my nearly 4 years there, producing serious award-winning investigative journalism under extremely difficult circumstances," he wrote.