(FILES) In this file photo taken on July 21, 2015 former German cyclist Jan Ullrich leaves after his appearance before a court in Weinfelden for his involvement in a three-car crash and driving under the influence of alcohol last year. - Troubled former cycling star Jan Ullrich is again under police investigation over a fresh assault allegation. A police spokesman confirmed to SID, an AFP subsidiary, that Ullrich, 44, Germany's only Tour de France winner, is suspected of "suddenly assaulting" a 34-year-old man in the security-check area at Hamburg airport on September 25, 2018. (Photo by Fabrice COFFRINI / AFP)