TheCodeBreakers
information.
At about the same time he lost his telescope. The United States
appears to have had some suspicion of the leak earlier in the spring,
when two officers came out from Washington to check on Fellers' security
measures. They cleared him, and perhaps this lulled their fears until new
information reached the Allies. Apparently a prisoner of war told the
British of the intercepts, and the British, who had themselves broken the
BLACK code and its su-perencipherment, using it to read other traffic, now
began to pick up Fellers' messages within an hour after he filed them.
After ten days of studying his "long, detailed, and extremely pessimistic"
reports, they notified American authorities late in June of the leak and
perhaps of Fellers' attitude. Fellers himself was never told of the German
solutions, but was recalled to Washington, returning in
July.* Later messages from Cairo still contained some noteworthy
annaabi.ee 
