American aircraft attacked Japanese transports at Davao, Philippines according to the U.S. Joint Intelligence Committee. Daily summary dated 24 December 1941

An item referred to G-2 Philippine Command reporting that 9 B-17s returning from Darwin, Australia attacked 12 Japanese transports at Davao, Mindanao although with unknown results.

Source

Map Room Papers (Roosevelt Administration), 1942 - 1945. U.S. Joint Intelligence Committee. Daily summary No. 14 dated December 1941.