Given a sentence and two mentions from the text (arguments), indicate a phrase (a verb or noun phrase) that describes the relationship between the provided arguments.

Sentence: 'A solemn voice came over our floor model Sears Silvertone radio informing us that Pearl Harbor had been attacked by Japanese aircraft and that thousands of lives were lost .', Argument/Subject 1: 'japanese', Argument/Subject 2: 'pearl harbor'
attack