In the aftermath of Japan's declaration of surrender, US B-32 Dominator bombers based in Okinawa began flying reconnaissance missions over Japan in order to monitor Japanese compliance with the cease-fire, gather information to better enable the establishment of the occupation, and test the fidelity of the Japanese, as it was feared that the Japanese were planning to attack occupation forces. During the first such B-32 reconnaissance mission, the bomber was tracked by Japanese radars but completed its mission without interference. On August 18, a group of four B-32s overflying Tokyo were attacked by Japanese naval fighter aircraft from Naval Air Facility Atsugi and Yokosuka Naval Airfield. The Japanese pilots were acting without authorization from the Japanese government. They were either opposed to the cease-fire or believed that Japanese airspace should remain inviolate until a formal surrender document was signed. They caused only minor damage and were held at bay by the B-32 gunners. The incident surprised US commanders, and prompted them to send additional reconnaissance flights to ascertain whether it was an isolated attack by die-hards acting independently or if Japan intended to continue fighting. The following day, two B-32s on a reconnaissance mission over Tokyo were attacked by Japanese fighter aircraft out of Yokosuka Naval Airfield, with the pilots again acting on their own initiative, damaging one bomber. One of the bomber's crewmen was killed and two others wounded. It was the last aerial engagement of the war. The following day, as per the terms of the cease-fire agreement, the propellers were removed from all Japanese aircraft and further Allied reconnaissance flights over Japan went unchallenged.