The 63rd District Court near Knapp Street and the East Beltline was closed after a package containing an unidentified powder was found Monday morning.

Fox 17 reports that workers discovered the envelope, which had come through the mail, around 9a.m.

The Kent County Sheriff's Office, Grand Rapids Fire Department Hazmat Team, and the FBI all responded. The courthouse was locked down while authorities determined the substance was contained and there was no threat to anyone in the building.

The courthouse reopened around 1p.m.

Authorities are still working to identify the powder.

If you have any information regarding the package, contact the Kent County Sheriff's Office or Silent Observer at 616-774-2345.