Despite the detainment of G.R.L.’s intrepid activist James Powderly, the group’s technology continues to cause problems for Chinese authorities. Five Americans were taken into custody yesterday for unfurling a “Free Tibet” banner in Beijing’s Olympic Park that was made out of “LED throwies,” small illuminating devices that were designed by Powderly and fellow G.R.L. founder Evan Roth. According to Free Tibet, the American activists “were detained by security personnel after displaying the banner for about 20 seconds at 11:48 pm August 19th. Their whereabouts are unknown.” Still no word from Powderly either, who’s now been held for about 48 hours. Here’s a photo gallery of the unveiling and a bonus video of the short-lived, but impactful display below.