HAGATNA, Guam: A Guam man was found guilty on Monday of killing three Japanese tourists and injuring 11 more during a frenzied knife attack in the Pacific island nation last year. Chad Ryan De Soto had pleaded not guilty to three counts of murder and 11 of attempted murder by reason of insanity, but a jury convicted him after a seven-week trial that included two weeks of deliberations. Officials said they would seek the maximum penalty when De Soto is sentenced on September 25, meaning the 22-year old potentially faces 14 life sentences without the prospect of parole. He has never provided an explanation for the night attack on February 12, 2013, when he ploughed his car into people in the tourist district of Tumon, then leapt from the vehicle and attacked bystanders at random with a knife in each hand. All of the victims were Japanese, including an eight-month-old baby and three-year-old toddler who both survived.