The attack history

Pakistan's former spy chief has told Al Jazeera that the country's intelligence services most likely sheltered Osama bin Laden in the years leading up to his death in a US raid.

Lieutenant General Asad Durrani told Al Jazeera's Mehdi Hasan he doubted the official line given by Pakistan's intelligence services, the ISI, that it was unaware of the al-Qaeda leader’s whereabouts until his death, implying that Pakistan would only have exchanged knowledge of his location in a quid-pro-quo deal.

"I cannot say exactly what happened but... it is quite possible that they [the ISI] did not know but it was more probable that they did," Durrani said.

Ex-spy chief says Pakistan likely sheltered Bin Laden