One year ago Osama bin Laden was shot dead by US Navy Seals during a raid on his home in Pakistan.

His death has brought a range of information on the reclusive al-Qaeda leader to light, however there are still some key pieces of information left in the dark.

Where exactly was he buried?

Following the Navy SEAL mission to infiltrate Bin Laden's Abbottabad complex, his body was taken away by the American secret service and buried at sea. The American government insisted it had done this in order to prevent his burial site becoming a shrine, however the usual conspiracy theories came to rise.

Intelligence company Stratfor's emails, leaked by Wikileaks, seem to suggest that Bin Laden's burial location was not quite where we told. So exactly where is the terror chief’s final resting place?

Exactly what happened when he died?

The top secret operation conducted by Navy SEAL unit Seal Team Six to take down Osama Bin Laden has been described in articles, documentaries and diagrams but we still don't know exactly what happened when the al-Qaeda boss was killed. Did he go down fighting? Did he surrender?

How long was he in Pakistan?

The manhunt for the al-Qaeda leader lasted close to ten years – his hiding skill became a decade-long-joke. Chased through Afghanistan's deserts, foothills and caves, Bin Laden was eventually found in a relatively comfortable, inconspicuous compound. But how long had he resided in Pakistan?

Who knew where he was?

His compound, with fortified walls, barbed wire and guards, was not exactly discreet. Yet Bin Laden managed to hide away in a country known to be a safe haven for terrorists and a country easily accessed from Afghanistan. In their efforts to find the Saudi, did Pakistan not check the heavily-armoured compounds with unknown occupants? Was he not seen on the street for however long he was there?

Just how much did Pakistan know about the operation?

One of the biggest controversies surrounding the mission itself was the admission by American President Barack Obama that the USA had not told Pakistan that it was going to launch a covert mission, invading sovereign airspace without permission. The president defended his actions by saying that it was a snap decision to raid Abbottabad, but how complicit were Pakistan security forces in taking down the most wanted man in the world?