Emergency responders headed to Children's Medical Center in Dallas Tuesday after reports of a white powder being found.
The call for help was received at 4:33 p.m. after the substance was found inside a clear, plastic bag at the Ambulatory Care Pavillion, not at the main hospital campus.
The powder turned out to be baby formula.
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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.