the TKNU managed to gain control of Seria, but was soon liberated by the 1/2nd Battalion Gurkha Rifles Regiment and Queen's Own Highlanders on 11 December 1962. A total of 99 Gurkha Infantry and 3 Commando Brigades were deployed by the British Far East Command. Administration Seria officially constitutes two village subdivisions, in which they are under Mukim Seria: Seria has also been incorporated as a municipal area () since 1959 and is the responsibility of the Kuala Belait and Seria Municipal Board, which also oversees Kuala Belait. The municipal area constitutes and encompasses parts of the aforementioned village subdivisions, bounded by Jalan Tengah and the Seria Arena to the north, Jalan Lorong Satu Barat to the east, Jalan Bolkiah to the south, and Jalan Lorong Tiga Barat to the west. Economy Oil and gas The town sits atop the Seria oil field, which was discovered in 1929 and has been continuously in production since then. The Brunei Shell Petroleum (BSP) Company Limited is headquartered in Panaga and has various facilities related to the oil and gas industry in Seria. The Seria Refinery is the only refinery in Brunei and is located in the Sungai Bera area, together with the Seria Crude Oil Terminal (SCOT), the New Gas Compression Plant (NGCP) and the New Industrial Area (NIA). The open-air oil water treatment facility at the Sungai Bera Holding Basin (SBHB) has since been discontinued due to environmental reasons. Demography Religion Religions in Seria include Christianity, Sikhism, Hinduism, Islam and Buddhism. Among the Christian churches, there are the St. Margaret's Church and Church of Our Lady of Immaculate Conception. Transportation Road Most of the roads within the municipality are surfaced. There are buses taking passengers to Bandar Seri Begawan and Miri from Seria. The Kuala Belait Highway from the Malaysian border west of Sungai Tujuh, Kuala Belait links up with multiple other highways leading to Bandar Seri Begawan and Muara Town. Rail There are no working railways or light rail in Seria. The route and remnants of a wooden railway from Seria to Badas that was built by the British Malayan Oil Company (now Brunei Shell Petroleum) before the war to service the water supply to Seria from the Badas pumping station on the Sungai Belait are still visible. BMP staff hid essential components of the railway from the Japanese during World War II who therefore were unable to restore it