21 February, 1964
Enemy activity in the Tringgus area. Tringgus is a horder with a police post. The populalion is about 80. The post is within 400 metres of the border and is situated in jungle covered hills 40 kilometres south-west of Kuching in the First Division. The post itself is an ordinary hut surrounded by barbed-wire placed at a sufficient distance so that hand grenades cannot be thrown at the hut from the perimeter. On the night of 21 February, 1964, the post was manned by a platoon, which is about 30 men.

At 11.00 p.m. when most of the platoon were preparing for sleep, a mortar bomb suddenly exploded in the hut. At the same time the firing of an automatic weapon approximately 200 rnetres away was also heard. The mortar bomb killed two and wounded six of the platoon. The enemy did not follow up the attack and slipped away quietly.A search was attempted but as the night was particularly dark and it was in the middle of a tropical monsoon storm, the tracks were untraceable.

The next day fragments of bullets fired from an armalite rifle were discovered. The armalite rifle has distinct characteristics and fires a soft metal bullet. It is known that the Indonesians have a limited number of these weapons acquired from the Colt Company of America. There are no such weapons either available to or in use by Malaysian Security Forces, and therefore the use of the armalite rifle demonstrates conclusively Indonesian involvement.

28 February, 1964
Following the incident on 21 February when two policemen were killed and six wounded, extra troops were sent to the area and patrolling activity was increased. Two unoccupied resting camps were discovered one kilometre to the east of Tringgus. In the camps which were in natural clearings in the jungle, fifteen 50 mm mortar bombs, a mortar cleaning kit wallet and a rifle were found. The registered number of the rifle is No. O-019810. On 28 February ten enemy in green uniforms were seen on a track leading towards Tringgus from the border. On sighting Security Forces they ran away to the north-west exchanging a few shots as they went. In their rush to escape they left behind four packs, four 50 mm mortar bombs, 29 rounds of 9 mm ammunition and a green shirt. A document in one of the packs was a Chinese booklet on guerilla warfare published in China. This could not have been obtained legally in Sarawak and therefore unerringly points to Indonesian origins.

29 February, 1964
The following day on 29 February one kilometre north-west of the above incident, 10 enemy were sighted. Firing at once started and Security Forces suffered one casualty. When the enemy retired they left behind four dead Chinese. On the bodies four handkerchiefs were found inscribed for comrades of the First Company. As Security Forces call their companies by letters such as ‘A’ Company, ‘B’ Company, etc., and also never call individuals by the title comrades, the group operating had come from outside Sarawak and the location of Tringgus close to the border showed they had come from Indonesia.

29 February, 1964
Later on the same day in the same area two Chinese surrendered; they appeared to be very frightened. Both had joined the Indonesian Irregulars and had been sent to Singkawang in Indonesia, where they received one month’s military training. Singkawang is known to be the location of an Indonesian Regular Army training camp for Irregulars. Their statements confirmed this. They were instructed by Indonesian Regular Army NCOs. Early in January their group, which consisted of themselves and 14 Indonesians who were lndonesian regulars, were ordered to move aCroSS the border.

They were instructed by the leader a Regular Army NC0 to move into First Division and to attack Security Force posts wherever they found them. The party was armed with two sub-machine guns, a mortar with mortar bombs, rifles and hand grenades. They were brought to the border in Indonesian Regular Army transport and crossed into Sarawak on 24 February. They further stated that before leaving the training camp in Indonesia the whole group changed from Indonesian Regular type uniform into Indonesian Irregular plain colourcd uniform before they left Singkawang. The two Chinese who were interrogated independently both told the same story.