Oct. 25 (UPI) -- American citizen Tigran Gambaryan has been released from a Nigerian jail after eight months of incarceration and on his way back to the United States, officials said. Gambaryan was released Thursday on "medical grounds" to allow him to return to the United States for specialized medical care, State Department spokesman Antony Blinken said in a statement . Advertisement The White House's national security advisor, Jake Sullivan, said they were "pleased" to have secured Gambaryan'