Thanks to its $200-million transformation, Chinatown has become a lure for daytime shopping and nighttime merriment. The revived area attracts tourists and locals, as well as another element: teenagers by the dozens. And they’re becoming a bit of a nuisance. As reported on the blog Prince of Petworth, an eyewitness recounted an incident in which one teen was jumped by another group of 30 or 40 teens. In a separate incident, an eyewitness wrote to the blog why.i.hate.dc recounting a male beaten unconscious by a group of teenagers who left the scene laughing. Police have created a task force, assigning at least 10 officers, five on foot and five on bikes, to patrol the area.