The Niagara County Courthouse will reopen on Tuesday after it was determined vitamin C powder and talcum powder were sent in a letter to the clerk's office.
Hazmat crews and multiple agencies were called to the Niagara County Courthouse after a suspicious substance was found Monday around noon.
The courthouse was evacuated and HAZMAT crews tested the suspicious substance.
Lockport Police tell 7 Eyewitness News the suspicious substance was delivered to the Niagara County Chief's Clerks Office.
The courthouse was closed for the remainder of the day.
The affected offices will be cleaned Monday evening.