Cylindrical object with flashing lights in Gagny

Summary

On April 20, 1996, a witness in Gagny observed from their apartment a cylindrical flying object with flashing lights on its underside. The object moved silently, slower than an aircraft, initially following a straight path. After a 180-degree turn, it began to ascend until it disappeared from view. The observation lasted about 10 minutes. No further details are available, and GEIPAN classified the case as C, with no explanation.