Which of the following is TRUE according to the news item?

The identities of the three arrested men and the precise charges they will face are still not known but all three are due to appear in court in Newark, New Jersey, and all three appear to be linked to an alleged plot to sell a Russian surface-to-air missile to terrorists.
    The first man to be held—said to be a British arms dealer—was reportedly arrested when he met undercover FBI agents posing as terrorists wanting to buy the weapon. The other two suspects were picked up at a New York gem dealership.
    The weapon itself was said by FBI sources to have been supplied by the Russian secret service, which co-operated in the sting operation. The missile they shipped to America had been modified so that it couldn’t work.
    FBI officials also stressed that, although the arms dealer might have boasted that he could supply a weapon capable of downing Air Force One, they were aware of no specific plot to attack that or any other aircraft.