Transportation Security Administration officers found an 8.5-inch knife in an enchilada carried by a passenger trying to board an Alaska Air flight at the Sonoma County airport.

The knife, which was inside a tray of enchiladas in the passenger's carry-on bag, was discovered Monday morning by screeners at a security checkpoint at the Charles M. Schulz-Sonoma County Airport, TSA spokesman Nico Melendez said.

A TSA officer spotted the knife when the passenger's carry-on bag was passing through an X-ray machine. Because the knife was "artfully concealed," TSA officers notified local law enforcement.

The woman told Sonoma County sheriff's deputies that she'd made the enchiladas over the weekend and didn't know how the knife wound up in the wrapping, Melendez said. Deputies cleared the woman to board the plane.

"They determined she wasn't a threat," Melendez said.

The woman was not cited or arrested, Melendez said. The TSA will review the case and could issue a civil penalty, he said.