Transportation Security Officer Michael Lombardo spotted something a little odd about a Sharpie marker when he was operating a computed tomography X-ray at Huntsville International Airport.

The seemingly harmless Sharpie was anything but: It appeared to be razor sharp. Fellow TSO Germaine Garlaza observed the image at a viewing station, and a did a bag search.

He did find a normal marker – and another one altered and containing a sharpened spike of fiberglass.

“For our officers to find this, it shows you how trained they are,” said Sari Koshetz, a Transportation Security Administration and U.S. Department of Homeland Security spokesperson. “We had an intel briefing that this was a possibility out there, that someone was modifying Sharpies into knives. And it happened right here in Huntsville.”

Discovery of threatening objects such as the knife disguised as a Sharpie is becoming more common as air travel gets back to normal in Huntsville.