I think it is the crash of B-25 41-30457 from the 341st BG, 11th BS (MACR 1631) which occurred on 30 December 1943. While conducting low level skip bomb attacks against shipping , the B-25 struck the mast of a ship and crashed into the river. The entire crew was killed. Pages from MACR shown here:
http://forum.armyairforces.com/FindPost/245303