American merchant ship ss Agwi World attacked by an enemy submarine according to the U.S. Joint Intelligence Committee. Daily summary dated 21 December 1941

An item referred to C.O.12h Bombardment Group G-2 Western Defense Command reporting that at 2:20 P.M. (P.S.T.) the American ss Agwi World was shelled by a large submarine 8 miles off Santa Cruz, Pacific Ocean coastline, California, USA although without suffering casualties.

Source

Map Room Papers (Roosevelt Administration), 1942 - 1945. U.S. Joint Intelligence Committee. Daily summary No. 11 dated 21 December 1941.