Haqqani’s diplomatic passport was also confiscated. He was serving as Pakistan’s ambassador to the United States since 2008.

Haqqani stepped down days after a Pakistani-American businessman Mansoor Ijaz said the envoy was behind a controversial memo that accused the Pakistani military of plotting a coup after Osama Bin Laden was killed in US operation in May.

Army Chief Gen. Pervez Kayani and other high-ranking military officials spent over eight hours in the Prime Minister’s Secretariat and finally Hussain Haqqani’s explanation was found “not satisfactory” by the prime minister and others.

Haqqani said on his Twitter account had sent his resignation to the prime minister. State television said his resignation had been accepted. “I have much to contribute to building a new Pakistan free of bigotry & intolerance,” Haqqani said on Twitter. “Will focus energies on that.” A spokesman for the prime minister’s office said Haqqani was asked to resign and there would be an investigation into the memo.

The controversial memo was published online by foreign newspapers, which was conveyed to Adm. Mike Mullen by Haqqani a week after the Bin Laden raid in May.  The memo was sent allegedly at the behest of President Asif Ali Zardari who, as the memo claimed, feared a military takeover.

He became entangled in controversy after the appearance of a column in the Financial Times. In that column, businessman Mansoor Ijaz said he delivered a memo to the Pentagon containing a plea for US help to stave off a military coup in the days after the May 2 US raid that killed Bin Laden in Pakistan.

Sources said that Haqqani will be further questioned about his dealings with Mansoor Ijaz, who is expected to arriving in Pakistan soon.