Report regarding observation of a space projectile over the Stockholm area

On August 12, 1946, Erik Grann submitted a follow-up report to the Air Defense Department of the Defense Staff in Stockholm regarding a sighting of a 'space projectile' that occurred on August 11, 1946, at approximately 20:46. Grann, who had previously submitted a report via the police (Katarinapolisen), provided additional technical details about the event. He estimated the object's altitude to be at least 10 kilometers and its speed to be significantly greater than 1,000 meters per second. From his observation point, located approximately 300 meters south of Brommaplan, he tracked the object from 80 degrees down to 30 degrees above the horizon. He noted that the light from the object ceased without cloud interference and that there was no explosion, only a 'shower of sparks.' Grann corroborated his account with a similar observation made by Arne Bergdahl of Lidingö, who witnessed the same projectile moving in a northern direction. The two observers were approximately 12 kilometers apart. Grann emphasized that the high altitude of the object was consistent with both observations and dismissed claims from other sources that the object was flying at an altitude of only a few hundred meters, arguing that the projectile's trajectory was likely measurable in thousands of kilometers.