In 1964, the situation remained tense in Tawau. A group of eight Indonesians were detained while trying to poison the water supply of the town. On 12 May 1964, there was a bombing attempt on the Kong Fah cinema. At the end of January 1965, a night time curfew was imposed in Tawau to prevent attackers from contacting the approximate 16,000 Indonesians living there. By the end of February 1965, 96 of the 128 Indonesian volunteers had been killed or captured, around 20 successfully retreated to Indonesia, and 12 remained at large. On 28 June 1965, an attempt by Indonesian troops to invade eastern Sebatik was repelled by a heavy bombardment by Australian destroyer HMAS "Yarra". In August 1965, an unknown assailant made an attempt to blow up a high-tension electricity pylon while in September 1965, a logging truck was destroyed by a land mine. The confrontation largely ended 12 August 1966, and in December there was a complete ceasefire in Tawau.