The Transportation Security Administration issued an advisory on Friday that a Piper PA 25 Pawnee crop-dusting aircraft was stolen from Ejido Queretaro, near Mexicali, Mexico, on Nov. 1.
“Although there is currently no indication that this has any connection to terrorist activity,” the TSA said, “the theft is cause for concern.”
The stolen aircraft is registered in Mexico and bears the tail number XBCYP. If you see the aircraft, the TSA says you should immediately contact the TSA General Aviation Hotline at (866) 427-3287. See a larger picture of a Piper PA 25 Pawnee here. 
The plane is a small single-engine, one seater aircraft that is used widely for crop dusting operations in several countries.
Any suspicious activity should be reported immediately to the TSA General Aviation Hotline at 866-GASECUR (866-427-3287).
The TSA has encouraged aerial-application operators and airport operators to take security measures such as storing aircraft in locked hangars with electronic security systems, parking airport heavy equipment such as trucks and forklifts where it would block aircraft access, use propeller locks and chains or tie-downs to secure aircraft stored outdoors.
Source: TSA; AVweb