Islamabad, (Agencies): A US legal firm representing the Bhutto-Zardari family has threatened to register a lawsuit seeking over $100 million in damages if Pakistan's Jang media group does not apologise for a report about President Asif Ali Zardari's alleged marriage to a doctor named Tanveer Zamani.

Locke Lord Bissell and Liddell, the legal firms in New York, served notice on Friday on the Jang group for publishing a defamatory article about Zardari.

The notice was issued on behalf of Mark Siegel, the publicist of slain former premier Benazir Bhutto, and the Bhutto-Zardari family. The notice stated Zamani had confirmed to Siegel that she had "never met" Zardari.

The Jang group had reported extensively on a rumour posted on several previously unheard of blogs and websites that the President had "secretly" married Zamani, a New York-based physician and PPP activist.

"Unless such a retraction and apology is issued immediately, Locke Lord Bissell and Liddell LLP will initiate legal action on behalf of the Bhutto-Zardari family for libel, malicious publication and intentional infliction of emotional distress in all jurisdictions where your newspaper has assets," stated the notice.

"This lawsuit will seek in surplus of $100 million, which the Bhutto-Zardari family will donate to the victims of the 2010 floods in Pakistan," the notice said.

"Publication of such a non-sourced fabrication was not only reckless, it was malicious. President Zardari has never met Dr Zamani," the notice stated. There was explanation on the development from the Jang group though The News, the group's English newspaper, posted a denial of the wedding by Zamani on its website.