Dallas Fire Rescue responded to a report of a letter containing white powder found in the parking lot of a plasma donation center on the 2600-block of South Lancaster Road Thursday morning.
Shortly after 10 a.m., DFR arrived at the scene and took the letter inside, out of the strong winds, for testing. Results on the substance are pending further testing.
There were approximately 20 people at the donation center at the time, and none show any sign of being exposed to anything hazardous.
After the letter was tested, the donation center was tested and determined to pose no threat -- so it was allowed to reopen.
DFR turned the matter over to the Federal Bureau of Investigation.
Letters containing powder invoke fear after five people were killed and more than a dozen were injured when letters laced with anthrax spores were mailed to offices in the days and weeks after Sept. 11, 2001.
Since then, hundreds of hoax letters have been received nationwide at schools, banks, hospitals and other businesses. Though they've been harmless, anyone receiving a white powder letter is advised to evacuate the area and call 911.