Updated from 4:32 p.m. EDTThe major indices in New York closed mixed on Thursday after a varied bag of economic data and earnings, and a bankruptcy filing for Chrysler, but they locked in solid gains for the month of April. The Dow Jones Industrial Average fell 17.61 points, or 0.2%, to 8168.12, while the S&P 500 slipped 0.83 points, or 0.1%, to 872.81. The Nasdaq added 5.36 points, or 0.3%, to 1717.30. For the month, the Dow rose 7.3%, its best April since 2001. The S&P gained 9.4%, and the Nasdaq added 12.3%, also marking the strongest April advance for those indices in years.