PERRY HALL, Md. (WJZ) — Hazmat crews are on the scene of a suspicious package in Perry Hall.
Baltimore County fire officials got the call just before 4 p.m. Thursday.
A package containing an unknown substance was found in a mailbox on Perry Hall Boulevard.
Authorities say it was delivered by the United States Postal Service.
A similar incident happened about a month ago in the same area.
Residents are being evacuated from the building as a precaution.