Federal authorities still hunting for ex-FBI agent who vanished 2,000 days ago

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.