FILE - In this Feb. 7, 2013 file photo, U.S. Postal Service letter carrier Jamesa Euler, delivers mail in the rain in the Cabbagetown neighborhood, in Atlanta. As many high-profile agencies sit idle because of the federal government shutdown, others are humming along just fine. Many of them have escaped the fiscal ax because they pay much of their own way, or enjoy a revenue stream that�s insulated from Congress. That means the cable bill and weekly grocery ads will still fill the mailbox, due to the stamps and other items the post office sells.(AP Photo/David Goldman, File)
GERMANTOWN, Tenn. (AP) -- Postal officials told residents of Germantown not to worry about white stuff on their mail -- it's not poison.
U.S. Postal Service spokesman David Walton said mail recipients in the Memphis suburb may notice a white film on letters delivered or picked up on Wednesday. That's because a fire extinguisher burst, spraying a white substance inside the Germantown post office.
Postal officials said the residue is not hazardous and determined safe by the poison control center.
There was no additional damage or delay to mail. Walton says it's not clear why the extinguisher exploded.
Germantown is a city of about 39,000 people east of Memphis.