Right after the dinner hour, a newly formed mob at Li Cheng Uk renewed the rock-throwing attacks on police. Nationalist flags were unfurled and a shouting mass of rioters charged into police lines. Four riot units of 240 men were called out and the strengthened force threw a cordon around six blocks while a sporadic exchange of rocks and tear gas continued. The area enclosed by the cordon became relatively quiet, but new disorders broke out along its southern edge. Police vehicles were attacked, and members of Triads were sighted in the center of the commotion. Rioting became general and violent by 10:30 P.M. and police set up roadblocks on main routes into the area. The mobs altered their tactics, splitting into small fighting squads that pounded a segment of the police lines with a swift, sharp attack, then scattered and ran before police could bring up reserves. Within a few minutes, the attack squads would re-form on another block and hit police lines again. As the evening advanced, the riot zone kept expanding into other parts of Kowloon. Police units were alerted on Hong Kong Island to forestall possible riots there. Police were only one of the mob targets. A fire engine returning from a minor blaze near the Kowloon resettlement estates was bombarded with bricks, bottles and chunks of concrete. The engine driver, struck on the head by a flying object, lost control of the truck and it plunged erratically into a crowd, killing three and injuring five. Ambulances were stoned as they arrived to pick up the casualties. An Auxiliary Fire Service vehicle was dumped over and set on fire. Hordes of rioters swarmed into the area, more police were summoned and a four-hour battle ensued. The looting phase of the riots began with an attack on a bakery in the heart of the disturbed area. After smashing the bakery windows and setting it afire, rioters turned their rock-and-stone batteries on firemen called to put out the flames. Two floors of the building were destroyed before the firemen could extinguish the blaze. Meanwhile, rioters went berserk on the streets, looting and burning shops until the massed strength of police laboriously regained control of the neighborhood. Another battle was fought in the crowded streets of Mongkok. Rocks were dropped on the police from balconies while Triad gangs embarked on the looting of shops. Marauding gangs roamed the Kowloon streets down to Austin Road, the northern edge of the tourist and luxury shopping section, before police hammered them into submission.