Muhammed Tillisy appeals the district court’s 1 dismissal of his 28 U.S.C. § 2241 petition challenging the Bureau of Prisons’ denial of his request for compassionate release. We dismiss the appeal as moot, because Tillisy was released from custody on March 30, 2009. See Calderon v. Moore, 518 U.S. 149, 150, 116 S.Ct. 2066, 135 L.Ed.2d 453 (1996) (per curiam) (when event occurs during pendency of appeal that renders it impossible for court to grant appellant any effectual relief whatsoever, appeal should be dismissed as moot).