HAGERSTOWN: Family members of US development expert Warren Weinstein, kidnapped in Pakistan by al Qaeda more than two years ago, say a recently released video and letter haven't convinced them he's alive.

His family released a statement Thursday asking for “date-specific” confirmation that Weinstein is alive and well.

Weinstein appeared in a video sent last week to reporters in Pakistan, appealing to US President Barack Obama to negotiate his release.

It was the first video of Weinstein since September 2012. There was no indication of when it was made. The handwritten note was dated Oct. 3.

The family members say they're concerned about Weinstein's health. His employer, J.E. Austin Associates, has said Weinstein needs medication used to treat heart problems.

The family asked Weinstein’s captors to release him immediately.