No one on the ground or in Pakistan's air defence spotted Area 51's latest toy as it kept watch on Osama bin Laden's compound in Abbottabad, Pakistan, on the night of the US raid that killed the Taliban leader.

Rather than one of the UFOs that the wilder fringes of the internet believe the military has stashed away at America's top-secret military site in Nevada, this "toy" was actually the latest Star Wars-type drone, or unmanned aerial vehicle (UAV), developed at the base whose existence Uncle Sam only barely admits.

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