Braunschweig Mayor Ulrich Markurth (SPD) and parade marshal Gerhard Baller canceled the parade at short notice shortly before 11.a.m. (1000UTC) on Sunday. The spectacle had been due to begin at 12.20 p.m. local time.
Local Braunschweig police said the Karneval parade had been called off after reliable state sources became aware of a "concrete threat" of an attack with an "Islamist background."
Also watch: Manchester Concert Bombing: What We Know Tuesday