Officials in Council Bluffs say the Water Works plant received a letter Wednesday containing a suspicious white substance. Council Bluffs Fire Chief Alan Byers told the Omaha-World Herald a Hazardous Materials crew determined the letter contained granulated sugar. The letter had been left in a drop box for water bill payments, and was not sent through the mail. It was the fourth time in a week suspicious substances had been received by authorities in Council Bluffs.  

On May 30^th and June 3^rd, the Pottawattamie County Sheriff’s Office received bulky packages containing a white substance. The substance received last month was said to be non-toxic, but additional tests were being conducted to determine what it was. Monday’s package was also deemed non-hazardous.  

Sheriff Jeff Danker told the paper investigators have an idea of where the packages came from, but their investigation was ongoing. Surveillance video at the Water Works plant is being reviewed to see if a suspect is observed placing the latest suspicious letter into the drop-box. Council Bluffs Police Sgt. Dave Dawson told the World-Herald a woman filed a complaint Tuesday with police, saying her brother had placed a letter with a powdery substance in it.  

All of the incidents are said to be related.