German authorities say they've found no evidence that there was a terrorist plot to attack a popular Carnival parade in Braunschweig, which was canceled in February because police said there was a "concrete threat."

Hannover prosecutor Joerg Froehlich said Wednesday that after more than three months of investigation, authorities found "neither evidence of an imminent attack nor of a criminal group."

Braunschweig police canceled the popular event in February after saying they received credible information of a "concrete threat of an attack with an Islamist background."

Froehlich said that information had come from a longtime informant for the state intelligence agency, who had allegedly overheard a conversation and concluded an attack was in the works.