When you see one of these over Manhattan, Washington, or San Francisco, be sure to thank the New York Times for publishing its December expose of NSA surveillance of terrorist communications.

Terrorists read the papers too, and have responded to the Timely warning by switching to disposable cell phones. ABC News reports today:

(1/13/06) – Federal agents have launched an investigation into a surge in the purchase of large quantities of disposable cell phones by individuals from the Middle East and Pakistan, ABC News has learned.

The phones which do not require purchasers to sign a contract or have a credit card have many legitimate uses, and are popular with people who have bad credit or for use as emergency phones tucked away in glove compartments or tackle boxes. But since they can be difficult or impossible to track, law enforcement officials say the phones are widely used by criminal gangs and terrorists.

“There’s very little audit trail assigned to this phone. One can walk in, purchase it in cash, you don’t have to put down a credit card, buy any amount of minutes to it, and you don’t, frankly, know who bought this,” said Jack Cloonan, a former FBI official who is now an ABC News consultant.

Law enforcement officials say the phones were used to detonate the bombs terrorists used in the Madrid train attacks in March 2004.

“The application of prepaid phones for nefarious reasons, is really widespread. For example, the terrorists in Madrid used prepaid phones to detonate the bombs in the subway trains that killed more than 200 people,” said Roger Entner, a communications consultant.

The FBI is closely monitoring the potentially dangerous development, which came to light following recent large-quantity purchases in California and Texas, officials confirmed.

In one New Year’s Eve transaction at a Target store in Hemet, Calif., 150 disposable tracfones were purchased. Suspicious store employees notified police, who called in the FBI, law enforcement sources said.

In an earlier incident, at a Wal-mart store in Midland, Texas, on December 18, six individuals attempted to buy about 60 of the phones until store clerks became suspicious and notified the police. A Wal-mart spokesperson confirmed the incident.

The Midland, Texas, police report dated December 18 and obtained by ABC News states: “Information obtained by MPD [Midland Police Department] dispatch personnel indicated that approximately six individuals of Middle-Eastern origin were attempting to purchase an unusually large quantity of tracfones (disposable cell phones with prepaid minutes attached).” At least one of the suspects was identified as being from Iraq and another from Pakistan, officials said.

“Upon the arrival of officers, suspects were observed moving away from the registers appearing to evade detection while ridding themselves of the merchandise.”

Other reports have come in from other cities, including Dallas, and from authorities in other states. Authorities in Pennsylvania, New York and other parts of Texas confirmed that they were alerted to the cases, and sources say other jurisdictions were also notified.