Complete the following sentence: German aircraft sighted the convoy on 28 April while it was 250 nautical miles (463 km) southwest of Bear Island. ️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️
Convoy QP 11, which left Murmansk in the Soviet Union on 28 April.