Five teenagers were arrested in the northern city of Hsinchu Monday for allegedly beating a former semiconductor engineer to death last week, police said. Yu Che-pin, a Canada-trained master's degree holder who once worked for a semiconductor company in the Hsinchu Science Park, was fatally beaten while chatting with a friend in the city's coastal Nanliao Park early Wednesday. He died shortly after being rushed to a nearby hospital. Police said they had screened security videos at 100-plus locations in the vicinity of the crime scene, including those installed at nearby convenience stores, and pored over data on more than 200 notorious street dragsters and those with previous criminal records in the city before tracking down the five suspected assailants. 'The five adolescent suspects have confessed to their involvement in the aimless killing spree,' said a Hsinchu police officer. The suspects told police that they rode on three motorcycles to Nanliao Park at around 1 a.m. June 10. They were having fun drinking on the park's elevated observation platform when they spotted Yu talking with a woman on the lawn nearby at around 2:30 a.m. They then planted a wooden bar in front of Yu in a provocative gesture. When Yu attempted to leave the scene, one of the suspects hit his head with another wooden stick found on park grounds. The four other accomplices then continued beating Yu and eventually fled when he collapsed to the ground. The teen attackers said they did not realize Yu had died until the following day when they read about it on the Internet. Interior Minister Liao Liou-yi and Hsinchu Mayor Lin Junq-tzer jointly hosted a news conference at Hsinchu City police headquarters to announce that the tragic case had been broken. Liao said the government put a high priority on the case and that the speed with which the crime was solved signified the government's determination to crack down on youth crime. Speaking on the same occasion, Lin said the city government will install more lamps and monitoring cameras at scenic spots around the city and step up counseling services for school dropouts to reduce the juvenile crime rate. Yu's death triggered an uproar in the city, which is the home of Taiwan's high- tech nerve center -- the Hsinchu Science Park. Internet users in the city launched a 'one man one letter' campaign after news of Yu's death spread. Local activists blamed the city government for failing to take effective measures to wipe out what they called rampant drag racing in the city. They recalled that three years ago, two science park engineers were seriously wounded by teen attackers in two separate cases. They appealed to campaign supporters to write to President Ma Ying-jeou and Premier Liu Chao-shiuan and urge them to take immediate steps to solve the case. They also questioned the credibility of Lin's high approval rating in some public opinion surveys, claiming that he has been unable to reduce the city's juvenile crime rate. Yu's heartbroken mother was quoted by local papers as saying that she hoped her son would be the last victim of this kind of aimless killing spree. 