Imam Salahuddin Muhammad could hardly miss Shahed Hussain when he first appeared three years ago at his mosque in the dilapidated town of Newburgh, just 60 miles up the Hudson River from New York. Hussain was flash, drove expensive cars and treated people to gifts of cash and food. Hussain would make Newburgh's Muslim community famous when earlier this year four other black Newburgh Muslims were jailed for 25 years for a 2009 plot to fire a Stinger missile at US military planes. All four followed the instructions of Hussain, who meticulously organised the scheme: from getting the missile and bombs, to reconnaissance missions, to teaching the tenets of radical Islam. Hussain was a fake. In fact, Hussain worked for the FBI as an informant trawling mosques in hope of picking up radicals. Yet far from being active militants, the four men he attracted were impoverished individuals struggling with Newburgh's grim epidemic of crack, drug crime and poverty. Hussain offered the men huge financial inducements to carry out the plot - including $250,000 to one man - and free holidays and expensive cars. The Newburgh Four ... represent the most extreme form of a controversial FBI policy to use invented terrorist plots to lure targets. There has been no case as egregious as this. It is unique in the incentive the government provided. A quarter million dollars?" said Professor Karen Greenberg, a terrorism expert at Fordham University.