Washington ? The FBI’s top counterterrorism official harbors lots of concerns: weapons of mass destruction, undetected homegrown terrorists and the possibility that old-fashioned mobsters will team up with al-Qaida for the right price.

Though there is no direct evidence yet of organized crime collaborating with terrorists, the first hints of a connection surfaced in a recent undercover FBI operation. Agents stopped a man with alleged mob ties from selling missiles to an informant posing as a terrorist middleman.

That case and other factors are heightening concerns about a real-life episode of “The Sopranos” teaming with Osama bin Laden’s followers.

“We are continuing to look for a nexus,” said Joseph Billy Jr., the FBI’s top counterterrorism official. “We are looking at this very aggressively.”

The new strategy involves an analysis of nationwide criminal investigations, particularly white-collar crime, side by side with intelligence and terrorist activity.

“We have developed an ability to look harder and broader in a greatly enhanced way to see if there is any crossover,” Billy said in an interview with The Associated Press.

Organized crime syndicates could facilitate money transfers or laundering, human smuggling, identification fraud or explosives and weapons acquisitions, officials said.

The options are many for terrorists groups.

There are the five reputed La Cosa Nostra families in New York, Russian criminal enterprises from Brighton Beach in the New York borough of Brooklyn to Moscow, and the emerging Asian crime syndicates that operate in many Islamic countries with al-Qaida offshoots.

A contract study produced recently for the Pentagon and obtained by the AP warned that the potential for organized crime assisting terrorists is growing.

“Although terrorism and organized crime are different phenomena, the important fact is that terrorist and criminal networks overlap and cooperate in some enterprises,” the study said. “The phenomenon of the synergy of terrorism and organized crime is growing because similar conditions give rise to both and because terrorists and organized criminals use similar approaches to promote their operations.”

The traditional mafia has highly developed networks for acquiring goods and services and money, all for a price.

The mob’s potential interest in helping a terrorist has nothing to do with ideology or sympathy but with greed, said Matt Heron, head of New York FBI’s organized crime unit.

“They will deal with anybody, if they can make a buck,” Heron said. “They will sell to a terrorist just as easily as they would sell to an order of Franciscan monks. It’s a business relationship to them.”

“If the mob has explosives and a terrorist wants them and they have the money, they could become instant friends.”

Pat D’Amuro, a retired senior FBI official and now chief executive officer of Giuliani Security, said a Mafia boss once acknowledged that the mob would help terrorists.

“I am aware of a high-level Mafia figure, who was cooperating with authorities, being asked if the Mafia would assist terrorists in smuggling people into Europe through Italy,” D’Amuro said. “He said, ‘the Mafia will help whoever can pay.”‘

Officials said they have no specific evidence that such a relationship has been cemented.

While the potential of a gangster-terrorist marriage is on the FBI’s radar, homegrown terror cells and weapons of mass destruction are also big concerns for those in the FBI given the job of stopping the next terrorist attack.

“We are not only aware that they want to come across the ocean to attack us but they may be physically here developing in our own homeland,” Billy said.

The Internet has become the new Afghanistan, allowing terrorist sympathizers to promote their radical ideas and to recruit and train followers right through their home computers. That makes it far more difficult for investigators to identify them.