This threat is here to stay:

“The FBI arrested three people Tuesday for allegedly plotting to smuggle a shoulder-launched surface-to-air missile into the United States, government and law enforcement sources said. The missile was successfully smuggled into a port in New Jersey from Russia, several U.S. government sources said. FBI agents arrested a British citizen of Indian descent Tuesday afternoon in Newark, New Jersey. Law enforcement sources said he was an independent arms dealer and had sold weapons to al Qaeda in the past.”