A suspicious letter prompted a scare at Sen. Bernie Sanders’ office in Vermont on Wednesday. The letter, sent to the senator’s Burlington office, had an unknown powder substance inside.There was a large emergency response.

Sen. Bernie Sanders’ office in Vermont reportedly received a suspicious envelope containing an unidentified powder Wednesday morning. MyNBC5 in Vermont reported that an employee of the senator’s Burlington office notified the Burlington Emergency Communications Center about the incident around 10 a.

The Vermont HAZMAT team later determined that the powder substance was not hazardous, and there was no threat to the office.