The young man accused of killing 7 people in a knife rampage in downtown Tokyo warned of the attacks in a series of messages to an Internet bulletin board, reports the AP. Tomohiro Kato, who rammed his truck into pedestrians before stabbing 17 of them, posted warnings from his cell phone, including one only 20 minutes before the attack that read simply, "It's time." (More Tomohiro Kato stories.)