TSA wants to know: Have you seen a stray Piper PA 25 Pawnee crop-dusting aircraft? It was stolen last week in Mexico.

“Although there is currently no indication that this has any connection to terrorist activity,” the TSA said, “the theft is cause for concern. Past information indicates that members of al-Qa’ida may have planned — or may still be planning — to disperse biological or chemical agents from cropdusting aircraft.”

(Photo of the aircraft is included in this PDF file.)

TSA doesn’t mention it, but fugitive Saudi pilot and suspected al Qaeda operative Adnan Shukrijumah remains the subject of an FBI manhunt along the U.S.-Mexico border and was reportedly tracked to Sonora, Mexico in August. Shukrijumah has been linked by federal authorities to Zacarias Moussaoui (who researched crop dusters), Jose Padilla and al Qaeda’s alleged dirty bomb plot. More here.

Could be something. Could be nothing. Like those missing propane cylinders. And that still-missing gas tanker stolen in Jersey.