The German government was eager to assassinate Churchill on his return flight home, and monitored flights in and out of the region in case the Prime Minister tried to sneak home aboard a civilian airliner. This scenario was plausible as Churchill flew to Britain from Bermuda in January 1942 aboard a scheduled commercial airline flight. Rumours had circulated since early May that Churchill might fly home from Lisbon. Some have speculated that Britain's Secret Intelligence Service planted these rumours to mask Churchill's travel itinerary.