Enemy submarines active along Mexican and US Pacific coastline according to the U.S. Joint Intelligence Committee. Daily summary dated 5 January 1942

An item reported that is was believed that 7 enemy submarines were active off the American Pacific coastline, possible supported by supply vessels. RDF bearings pointed out supply vessels in the vicinity of Kodiak and 1,000 miles north east of Hawaii. Until now no supply vessels were actually sighted. The reports of enemy [Japanese?] submarine bases along the Mexican Pacific coast could not be confirmed.

Source

Map Room Papers (Roosevelt Administration), 1942 - 1945. U.S. Joint Intelligence Committee. Daily summary No. 26 dated 5 January 1942