The family of Warren Weinstein is calling on his Al-Qaeda captors to release the 72-year-old, who was kidnapped in Pakistan more than two years ago.
Weinstein's family released a statement on January 2 asking for "date-specific" confirmation that Weinstein is still alive.
A 13-minute video and handwritten letter from Weinstein were sent to media last week.
In the video, Weinstein spoke of feeling "totally abandoned and forgotten" and appealed to U.S. President Barack Obama to negotiate his release.
The handwritten note was dated October 3 and there was no indication of when the video was made.
Family members said they are concerned about Weinstein's health and requested his captors release him immediately.
Based on reporting by AP and dpa