Dawood Ibrahim, India's most wanted criminal and an accused in the 1993 Mumbai bombings, has been unwell and frequently visiting a hospital in Karachi, sources told HT on Saturday.
Dawood's health came into focus after overnight reports that the mob boss had suffered a heart attack and was dying in a hospital.
The 61-year-old fugitive, who fled India in the 1990s and is believed to have since settled in Pakistan, was last seen at a party at former Pakistan cricketer Javed Miandad's house on April 19, the sources said.
Miandad's son, Junaid, married Ibrahim's daughter, Mahrukh, in 2005.
Pakistan denies Dawood is in the country.
The sources said though Dawood is suffering from gangrene of limbs and had a stroke in the past, he is not in the hospital or in a
critical condition. He is known to visit the Karachi hospital frequently for medical rehabilitation.
Dawood is believed to control part of the Mumbai underworld that invests in real estate and the film industry.
Indian security agencies say the 'D-Company' reaches across the border into India for its extortion activities, pedals fake Indian currency and is neck-deep in the piracy of Indian music and films.
Dawood's organisation has business investments in Pakistan and the United Arab Emirates, with the empire largely founded on threats and extortions.
Interpol has a red corner notice, or an international arrest warrant, out against Dawood and a host of his associates for their involvement in the 1993 serial blasts that killed 257 Indians and injured hundreds.