Two Polish janitors of Peenemünde's Camp Trassenheide in early 1943 provided maps, sketches and reports to Polish Home Army Intelligence, and in June 1943 British intelligence had received two such reports which identified the "rocket assembly hall", "experimental pit", and "launching tower". The Allies also received information about the V-1 and V-2 rockets and the production sites from the Austrian resistance group around the priest Heinrich Maier. The group later discovered by the Gestapo was in contact with Allen Dulles, the head of the US secret service OSS in Switzerland, and informed him about the research in Peenemünde.