US Army bombers attacked Japanese shipping off Balikpapan, Dutch East Indies according to the U.S. Joint Intelligence Committee. Daily summary dated 30 January 1942

An item reported that US Army bombers attacked on 28 January Japanese shipping off Balikpapan, Dutch East Indies, straddling a cruiser, sinking one large transport and setting another transport on fire.

Source

Map Room Papers (Roosevelt Administration), 1942 - 1945. U.S. Joint Intelligence Committee. Daily summary No. 51 dated 30 January 1942