KARLSRUHE, Germany, March 4 — A German appeals court ordered a retrial Thursday for Mounir el-Motassadeq, the only person successfully prosecuted for involvement in the Sept. 11 attacks.
Complaining that crucial evidence had been withheld by the German and American authorities, a five-judge panel threw out the year-old conviction of Mr. Motassadeq and sent the case back to the lower court in Hamburg, which had sentenced him to 15 years in prison on more than 3,000 counts of accessory to murder.