Pakistan's ambassador to the US, Husain Haqqani has said that he and his embassy were receiving threatening phone calls and emails ever since Osama bin Laden was killed in a US operation near Islamabad.

Haqqani said Pakistan would conduct an inquiry into how such an intelligence lapse occurred but added that such threats show how his country's contribution to fighting terrorism was being ignored while only failures are being highlighted.

"I'm getting threatening phone calls. My embassy is getting threatening phone calls. They're people sending e-mails saying, instead of recognising what Pakistan has contributed, the failure is being pointed out," Haqqani told the popular Charlie Rose show.

Haqqani said the Pakistan government will get to the bottom of it but it an important concern right now was to reassure people in the United States that Pakistan as a nation did not look upon Osama bin Laden favourably.