A threatening letter sent to the Erie County District Attorney’s Office temporarily evacuated a section of the court house and launched multiple investigations.

According to the Erie County District Attorney John Flynn, around 11:15 Monday morning, one of his employees opened a letter from a New York State inmate that threatened to blow up the building. The letter also contained a suspicious white powdery substance.

The bomb squad and a hazmat team evacuated an entire wing of the building.

The substance was later determined to be Ivory Soap shavings.

The DA is trying to pinpoint who sent the letter.

The inmate's name and identification number on the envelope matches a suspected member of a street gang who was prosecuted by the DA's office in the last five years.

The letter was signed with an Arabic name with ISIS written below.

"This matter is being investigated fully,” Flynn said.  “If warranted, and I find out who exactly did this, charges will be filed against this individual. I don't care how long he is in prison for. I will file additional charges and make sure he is in prison a lot longer."

The DA is also trying to figure out how the letter made it through the prison's inspection process.