The Sultan retained his throne and was given a pension and honours by the Japanese. During the later part of the occupation, he resided at Tantuya, Limbang and had little to do with the Japanese. Most of the Malay government officers were retained by the Japanese. Brunei's administration was reorganised into five prefectures, which included British North Borneo. The Prefectures included Baram, Labuan, Lawas, and Limbang. Ibrahim hid numerous significant government documents from the Japanese during the occupation. Pengiran Yusuf (later YAM Pengiran Setia Negara Pengiran Haji Mohd Yusuf), along with other Bruneians, was sent to Japan for training. Although in the area the day of the atomic bombing of Hiroshima, Yusuf survived.