( CNN ) -- Wednesday marks day 2,000 since retired FBI agent Robert Levinson disappeared in Iran , and the State Department is urging Tehran to provide information on his whereabouts . `` Determining Mr. Levinson 's whereabouts and reuniting him safely with his family continues to be a priority for the U.S. government . The United States also continues to welcome the assistance of our international partners in this investigation , '' U.S. State Department spokeswoman Victoria Nuland said . An FBI reward of $ 1 million for information leading to Levinson 's safe return still stands . Levinson , who became a private investigator after retiring from the FBI , was working on a cigarette smuggling case when he disappeared more than five years ago while on a business trip on Iran 's Kish island on March 8 , 2007 . The State Department has consistently denied Levinson was working for the U.S. government and has unsuccessfully pressed Tehran for information . Read more : Who is missing American Robert Levinson ? In March 2011 , Secretary of State Hillary Clinton announced the U.S. government had received indications that Levinson was being held by a group in a region that includes the border areas of Afghanistan , Iran , and Pakistan . At the time , the Iranian government said it would make inquiries about Levinson but did not know what happened to him . Later , the FBI said it did not know what group was holding Levinson , what the group 's demands might be or even a reason for his capture . Whoever his captors are , they sent a `` proof of life '' videotape and photographs of Levinson to his family in 2010 . In the video , Levinson asked the U.S. government for help : `` Please help me get home , '' said a gaunt-looking Levinson on the tape , citing his 33 years of service in the FBI as a reason for that assistance . Levinson suffers from diabetes and appeared to have lost 50 to 60 pounds since his capture . He turned 64 on March 10 . In addition to his wife of 38 years , Levinson has seven children and two grandchildren . Levinson 's family aired their angst and anguish in a statement released Tuesday : . `` Two thousand days since Bob has heard the voices of his children and his wife , and since we have heard his . Two thousand days since he has worn the clothes in his closet -- which we are sure no longer fit him - and 2,000 days since he has slept on his side of the bed . `` It is time for Bob to be released . '' CNN 's Deborah Doft and Lateef Mungin contributed to this report .
Retired FBI Special Agent Robert Levin vanished in Iran . He was working as a private investigator . The " ` ` placed its call on the Government of the Islamic Republic of Iran , '' official says . The FBI is offering $ 1 million for information leading to Levinson 's safe return .