Family members say the only man convicted in the 1988 Lockerbie bombing has been taken to intensive care after his condition worsened.
Abdelbaset Ali Mohmed Al Megrahi has terminal prostate cancer and Libyan officials have said his health has swiftly deteriorated since his release from a Scottish prison less than two weeks ago.
The family members, who spoke on condition of anonymity because of the sensitivity of the matter, said they have not been allowed to visit him.
There was no way to independently verify his condition.
Scottish officials released Megrahi from prison on August 20 on compassionate grounds, sparking an international uproar.
At the time, Scottish officials said doctors had determined he had less than three months to live.