Pakistani President Asif Ali Zardari has alleged that elusive Al Qaeda leader Osama bin Laden was a US operator who had tried to destabilise his late wife Benazir Bhutto's government back in 1989.

In fact, as premier Bhutto had "warned America about Osama bin Laden in 1989 with a call to then US president George H. Bush", Zardari said on NBC's Meet the Press programme Sunday.