Japanese successfully blockading inter-island traffic in the Philippines according to the U.S. Joint Intelligence Committee. Daily summary dated 27 March 1942

An item reported that the enemy with just a few naval vessels managed to blockade since recent the inter-island traffic in the Philippines.

Source

Map Room Papers (Roosevelt Administration), 1942 - 1945. U.S. Joint Intelligence Committee. Daily summary No. 107 dated 27 March 1942.